
The Air Force Association (AFA) is an independent, 501(c)(3) non-profit, professional military and aerospace education association that promotes American aerospace power. It is headquartered in Arlington, Virginia.

America Supports You was a United States Department of Defense program proving opportunities for citizens to show their support for the U.S. armed forces. The program was launched in November 2004 to highlight citizen support for U.S. military men and women.

American Ambulance, Great Britain (AAGB) was a humanitarian organisation founded in 1940 by a group of Americans living in London for the purpose of providing emergency vehicles and ambulance crews to the United Kingdom during World War II. The idea for the service came from Gilbert H. Carr during a meeting of the The American Society in London shortly after the Dunkirk evacuation.

American Gold Star Mothers, Inc. (AGSM), is a private nonprofit organization of American mothers who lost sons or daughters in service of the United States Armed Forces. It was originally formed in 1928 for mothers of those lost in World War I, and it holds a congressional charter under Title 36 § 211 of the United States Code. Its name came from the custom of families of servicemen hanging a banner called a service flag in the windows of their homes. The service flag had a star for each family member in the Armed Forces. Living servicemen were represented by a blue star, and those who had lost their lives in combat were represented by a gold star.

American Veterans for Equal Rights (AVER) is the oldest Lesbian, Gay, Bisexual and Transgender Veterans Service Organization (VSO) in the United States. Founded in 1990, AVER will commemorate 30 years of service to the LGBT community in 2020. AVER is a non-profit VSO that supports and advocates for the rights of lesbian, gay, bisexual and transgender military veterans, active duty service members, and their families.
The American War Mothers was founded in 1917 and given a Congressional charter on February 24, 1925. It is a perpetual patriotic, 501(c) 4 non-profit, non-political, non-sectarian, non-partisan organization whose members are mothers of children who have served or are serving in the Armed Services during a time of conflict.

Armed Forces Entertainment (AFE) is the official United States Department of Defense (DoD) agency for providing entertainment to U.S. military personnel overseas. Armed Forces Entertainment hosts over 1,200 shows around the world each year, reaching over 500,000 personnel at 355 military installations. Types of talent include musicians, comedians, cheerleaders, and celebrities of sports, movies and television.

Army Emergency Relief (AER), often referred to by the longer title Army Emergency Relief Fund, is a non-profit, charitable organization independent of, but closely associated with the United States Army, founded in 1942. The organization is headquartered in Arlington, VA.

The Army Wounded Warrior Program (AW2) is the official U.S. Army program that assists and advocates for severely wounded, ill or injured Soldiers, Veterans, and their Families and Caregivers, wherever they are located, regardless of military status. Soldiers who qualify for AW2 are assigned to the program as soon as possible after arriving at the Warrior Transition Unit (WTU). AW2 supports these Soldiers and their Families throughout their recovery and transition, even into Veteran status. Through the local, personalized support of AW2 Advocates, AW2 strives to foster the Soldier's independence. There are more than 20,000 severely wounded, ill and injured Soldiers and Veterans currently enrolled in AW2.

Blue Star Mothers of America, Inc. (BSMA), is a private nonprofit organization in the United States that provides support for mothers who have sons or daughters in active service in the U.S. Armed Forces. It was originally formed during World War II. The name came from the custom of families of servicemen hanging a banner called a Service Flag in a window of their homes. The Service Flag had a star for each family member in the military. Living servicemen were represented by a Blue Star and those who had lost their lives were represented by a Gold Star. Until 2011, membership in the Blue Star Mothers was open to any woman living in America who has a son or daughter in the United States Armed Forces, or who has had a son or daughter in the U.S. Armed Forces who has been honorably discharged.
The British War Relief Society (BWRS) was a US-based humanitarian umbrella organisation dealing with the supply of non-military aid such as food, clothes, medical supplies and financial aid to people in Great Britain during the early years of the Second World War. The organisation acted as the administrative hub and central receiving depot for items donated from other charities which were then parceled out to its affiliate organizations in the US and to Britain. These donations were raised in the name of the BWRS, rather than in the name of the smaller groups.

The Coast Guard Mutual Assistance (CGMA) is an independent non-profit charitable organization of United States Coast Guard people assisting the Coast Guard family, including active duty, retired military, Coast Guard civilian employees, Coast Guard Reserve, Coast Guard Auxiliary, Public Health Service officers serving with the Coast Guard, and surviving family members. It receives no government funding, and has provided more than $200 million in financial assistance since 1924. There are more than 400 CGMA Representatives at 96 shore units and 38 cutters based in 32 states and territories, including Puerto Rico and Guam. CGMA receives no federal funds, and relies on bequests and donations from Coast Guard people. Most assistance is provided through interest-free loans and personal grants. These include educational support for members and their dependents, emergency travel, temporary living expenses, funeral expenses, loss of funds or property, disaster relief, medical and dental expenses, home studies expenses for adoptions, and debt management. The Supplemental Education Grant (SEG) program was enhanced in 2015. There is also a Layette Program to welcome infants. In 2017 CGMA provided 6 million dollars in direct assistance to its clients. Since 1924 CGMA has provided more than $187 million in assistance. CGMA has a four-star rating from Charity Navigator.

The Code of Support Foundation (COSF) is a U.S. nonprofit organization that provides assistance to military service members, veterans and their families, many of whom face multiple and complex challenges. Based in Alexandria, Virginia, the group offers three types of programs: casework, online networking among other military service organizations, and outreach efforts.

The Concerned Officers Movement (COM) was an organization of mainly junior officers formed within the U.S. military in the early 1970s whose principal purpose was opposition to the U.S. involvement in the Vietnam War. Very quickly, however, it also found itself fighting for First Amendment rights within the military. It was initiated in the Washington, D.C. area by commissioned officers who were also Vietnam Veterans, but rapidly expanded throughout all branches and many bases of the U.S. military, ultimately playing an influential role in the opposition to the Vietnam War.

The Defense Manpower Data Center (DMDC) serves under the Office of the Secretary of Defense to collate personnel, manpower, training, financial, and other data for the Department of Defense. This data catalogues the history of personnel in the military and their family for purposes of healthcare, retirement funding and other administrative needs. It has offices in Seaside, California and Alexandria, Virginia.

Distinguished Flying Cross Society (DFCS) was founded in 1994 nonprofit war veterans’ organization, located in San Diego, California. There are 32 chapters and 7000 members of the DFCS.

The Fleet Reserve Association (FRA) is a non-profit U.S. military and veterans organization headquartered in Alexandria, Virginia. chartered by the United States Congress that represents the interests of enlisted Navy, Coast Guard, and Marine veterans and active duty personnel in the United States.

Freedom Station is a non-profit 501c charitable organization located in San Diego, California whose mission is to assist recovering injured military service members who are awaiting their retirement or discharge from their respective branch of the United States military service.

GI Coffeehouses were a consequential part of the anti-war movement during the Vietnam War era, particularly the resistance to the war within the U.S. military. They were mainly organized by civilian anti-war activists as a method of supporting antiwar and anti-military sentiment among GIs, but many GIs participated as well. They were created in numerous cities and towns near U.S. military bases throughout the U.S as well as Germany and Japan. Due to the normal high turnover rate of GIs at military bases plus the military's response which often involved transfer, discharge and demotion, not to mention the hostility of the pro-military towns where many coffeehouses were located, most of them were short-lived, but a few survived for several years and "contributed to some of the GI movement's most significant actions". The first GI coffeehouse of the Vietnam era was set up in January 1968 and the last closed in 1974. There have been a few additional coffeehouses created during the U.S. led wars in Iraq and Afghanistan.

GI's Against Fascism was a small, short-lived organization formed within the U.S. Navy during the years of conscription and the Vietnam War. The group grew out of a small number of sailors requesting adequate quarters, but coalesced into a small formal organization with a wider agenda: a more generalized opposition to the war and to perceived institutionalized racism within the U.S. Navy. Although there had been earlier antiwar and GI resistance groups within the U.S. Army during the Vietnam era, 'GI's Against Fascism' appears to be the first such group in the U.S. Navy. The group published an underground newspaper as a means of spreading its views.

The Gold Star Wives of America (GSW) is a private nonprofit organization formed before the end of World War II to provide support for the spouses and children of those who lost their lives while serving in the Armed Forces of the United States.

Hope For The Warriors is a national nonprofit organization in the United States that provides assistance to combat wounded service members, their families, and families of those killed in action. The organization focuses on those involved in Operation Iraqi Freedom and Operation Enduring Freedom and their families. Hope For The Warriors recently received a Four-Star Rating from Charity Navigator and was highlighted by George W. Bush in the Warrior Open.

The Military Association of Atheists and Freethinkers (MAAF) is a community for atheists and freethinkers in the military, both within the United States and from around the world. The MAAF can assist U.S. military members to respond to illegal and insensitive religious proselytizing on military bases. It is an independent 501(c)(3) organization building community for freethinkers and other nontheists in the military. The MAAF supports constitutional separation of church and state and First Amendment rights for all service members. It also educates and trains both the military and civilian community about atheism and Freethought in the military.

The Military Order of the Carabao is a social club open to officers of the U.S. military and war correspondents who served in the Philippines or on overseas official military campaigns. The order was initially created to satirize the pompous and pretentious Military Order of the Dragon. Descendants of those eligible for membership are themselves eligible, regardless of military service. As of 2016 the annual dues were US$50.
The Military Order of the Dragon. The purpose was to record the history and conserve the memory of the military campaign in China in the year 1900. Provision being made for admitting to honorary membership the officers of foreign armies on service in China between June 15 and October 1, 1900.

Morale, Welfare and Recreation, abbreviated MWR, is a network of support and leisure services designed for use by U.S. servicemembers, their families, military retirees, veterans with 100 percent service-connected disability, current and retired DoD civilian employees, and other eligible participants.

Move America Forward is a nonprofit military charity based in Sacramento, California. Howard Kaloogian, Melanie Morgan and Sal Russo established the organization in 2004. The organization supports front-line United States Armed Forces troops serving in Iraq and Afghanistan.

The Movement for a Democratic Military (MDM) was an antiwar and GI rights organization during the Vietnam War. Initially formed in late 1969 as a merger of sailors from San Diego and marines from the Camp Pendleton Marine Base in Oceanside, CA, it rapidly spread to a number of other cities and bases in California and the mid-West, including San Francisco, Long Beach Naval Station, El Toro Marine Air Station, Fort Ord, Fort Carson and the Great Lakes Naval Training Center. Heavily influenced by the Black Panther Party and the Black militancy of the times., it became one of the more radical GI organizations during that era and was investigated in 1971 by the House Committee on Internal Security. As with much of the GI movement during this era, chapters had a high turnover as members were transferred, discharged and disciplined by the military. By late 1970 several chapters had splintered or disbanded, but the group's name and demands proved popular within the GI resistance movement overall. Some chapters continued through 1971 and 1972 and one until 1975.

The National Guard Association of the United States was founded in 1878 as a congressional lobbying organization for National Guard issues. A member of the Military Coalition, NGAUS lobbies on behalf of 45,000 officers who comprise the membership of the organization. It has been partially or solely responsible for winning a number of benefits, ranging from health to retirement, for National Guard forces nationwide. It also operates NGAUS Insurance Trust, which provides products to full-time federal technicians, including life insurance. It also operates the National Guard Educational Foundation, which focuses on educating the public about the National Guard.

National Naval Officers Association (NNOA) is a support organization of the United States Navy, United States Marine Corps and the United States Coast Guard.

Operation Homefront is a nonprofit 501(c)(3) organization headquartered in San Antonio, Texas and Arlington, Virginia. Its stated mission is to "build strong, stable, and secure military families so that they can thrive in the communities they have worked so hard to protect." The current CEO and President is John I. Pray, Jr., Brig Gen, USAF (Ret).

The Order of Daedalians is a fraternal and professional order of American military pilots. The namesake of the order is Daedalus who according to Greek mythology was the first person to achieve heavier-than-air flight.

OutServe-SLDN was a network of LGBT military personnel, formed as a result of the merger between OutServe and the Servicemembers Legal Defense Network. OutServe-SLDN was one of the largest LGBT employee resource groups in the world. OutServe was founded by a 2009 graduate of the US Air Force Academy, Josh Seefried and Ty Walrod. There were over 7,000 members and 80 chapters worldwide.

The Rocks Incorporated, was founded on October 9, 1974 by sixty-five United States Army officers in Washington, D.C. Headquartered in Forestville, Maryland and with over 1,100 members, it is the largest professional military officers’ organization with a majority African-American membership.

The Roman Catholic Archdiocese for the Military Services, USA, provides the Roman Catholic Church's pastoral and spiritual services to those serving in the armed forces of the United States and their dependents and to all military and naval bases, to the facilities of the Veterans Administration, and to other federal services overseas.

Special Kindness In Packages, Inc. was a U.S. 501(c)(3) charitable nonprofit corporation that provided free and fun care packages to U.S. military personnel deployed overseas.

Society of the Army of Santiago de Cuba was an organization, the purpose of which was to record the history and conserve the memory of the events of the campaign which resulted in the surrender, on July 17, 1898, of the Spanish army, the city of Santiago de Cuba, and the military province to which it pertained during the Spanish–American War.

The Soldiers', Sailors', Marines', Coast Guard and Airmen's Club is a private social club founded in 1919 and located at 283 Lexington Avenue between East 36th and 37th Streets in the Murray Hill neighborhood of Midtown Manhattan, New York City. It is the only private organization in the New York area accommodating U.S. servicemen and servicewomen at subsidized rates. It also caters to military retirees and veterans and their families.

SoldierStrong is a Stamford, Connecticut based 501(c)(3) charitable organization whose mission is to improve the lives of the men and the women of the United States Armed Forces.

Special Kindness In Packages, Inc. was a U.S. 501(c)(3) charitable nonprofit corporation that provided free and fun care packages to U.S. military personnel deployed overseas.

The Stop Our Ship (SOS) movement, a component of the overall civilian and GI movements against the Vietnam War, was directed towards and developed on board U.S. Navy ships, particularly aircraft carriers heading to Southeast Asia. It was concentrated on and around major U.S. Naval stations and ships on the West Coast from mid-1970 to the end of the Vietnam War in 1975, and at its height involved tens of thousands of antiwar civilians, military personnel and veterans. It was sparked by the tactical shift of U.S. combat operations in Southeast Asia from the ground to the air. As the ground war stalemated and Army grunts increasingly refused to fight or resisted the war in various other ways, the U.S. “turned increasingly to air bombardment”. By 1972 there were twice as many Seventh Fleet aircraft carriers in the Gulf of Tonkin as previously and the antiwar movement, which was at its height in the U.S. and worldwide, became a significant factor in the Navy. While no ships were actually prevented from returning to war, the campaigns, combined with the broad antiwar and rebellious sentiment of the times, stirred up substantial difficulties for the Navy, including active duty sailors refusing to sail with their ships, circulating petitions and antiwar propaganda on board, disobeying orders, and committing sabotage, as well as persistent civilian antiwar activity in support of dissident sailors. Several ship combat missions were postponed or altered and one ship was delayed by a combination of a civilian blockade and crewmen jumping overboard.

The Tailhook Association is a U.S.-based, non-profit fraternal organization, supporting the interests of sea-based aviation, with emphasis on aircraft carriers. The word tailhook refers to the hook underneath the tail of the aircraft that catches the arresting wire suspended across the flight deck in order to stop the landing plane quickly.

Things We Read (TWR) is a charity and military service organization that promotes reading by collecting book recommendations from influential citizens and donating books to members of the armed forces and local communities. It operates as a nonprofit 501(C)(3) organization.

United American Patriots (UAP) is an American nonprofit organization which advocates and funds legal defense for American service members they believe to have been unjustly convicted and wrongfully imprisoned on war crimes charges. Herbert Donahue, a retired Marine Corps major who served in Vietnam, founded the group in 2005. Retired Marine Lt. Col. David "Bull" Gurfein serves as CEO. They have advocated on behalf of such American soldiers as Robert Bales, Corey Clagett, Derrick Miller, Clint Lorance, and Eddie Gallagher.

The United Service Organizations Inc. (USO) is an American nonprofit-charitable corporation that provides live entertainment, such as comedians, actors and musicians, social facilities, and other programs to members of the United States Armed Forces and their families. Since 1941, it has worked in partnership with the Department of War, and later with the Department of Defense (DoD), relying heavily on private contributions and on funds, goods, and services from various corporate and individual donors. Although it is congressionally-chartered, it is not a government agency.

USNA Out is an American non-profit organization of lesbian, gay, bisexual and transgender (LGBT) Alumni of the U. S. Naval Academy in Annapolis, Maryland. USNA Out is an independent 501(c)(3) organization that does not represent the Naval Academy Alumni Association nor the U. S. Naval Academy. USNA Out is the first LGBT organization representing alumni from a federal service academy.

Veteran Tickets Foundation (Vet Tix) is a national, non-profit, 501c(3) organization located in Phoenix, Arizona that gives free event tickets to Veterans, Active Duty Military and their families.

The Vietnamese American Armed Forces Association, , is a non-profit, non partisan professional military association. It is the first military association for Vietnamese American service members in the United States. Its members are Active, Reserve, National Guard, and Veterans of the U.S Armed Forces; Enlisted and Commissioned Officers from the five branches of the U.S. Military; U.S. Army, U.S. Marine Corps, U.S. Navy, U.S. Air Force, and U.S. Coast Guard and the two noncombatant uniformed services the National Oceanic and Atmospheric Administration Commissioned Corps (NOAAC) and the United States Public Health Service Commissioned Corps (PHSCC).

The Women's National War Relief Association was an American relief organization founded during the Spanish–American War to give comfort to the officers, soldiers and sailors in the United States Military. The women founding the association used the group as a means for women "to supplement with material aid the sacrifices of time, strength, and life made by the men of the nation" during the military conflict.

Wounded Warrior Project (WWP) is a charity and veterans service organization that offers a variety of programs, services and events for wounded veterans of the military actions following September 11, 2001. It operates as a nonprofit 501(c)(3) organization.