"Don't ask, don't tell" (DADT) was the official United States policy on military service of non-heterosexual people. Instituted during the Clinton administration, the policy was issued under Department of Defense Directive 1304.26 on December 21, 1993, and was in effect from February 28, 1994, until September 20, 2011. The policy prohibited military personnel from discriminating against or harassing closeted homosexual or bisexual service members or applicants, while barring openly gay, lesbian, or bisexual persons from military service. This relaxation of legal restrictions on service by gays and lesbians in the armed forces was mandated by Public Law 103–160, which was signed November 30, 1993. The policy prohibited people who "demonstrate a propensity or intent to engage in homosexual acts" from serving in the armed forces of the United States, because their presence "would create an unacceptable risk to the high standards of morale, good order and discipline, and unit cohesion that are the essence of military capability".
Lesbian, gay, bisexual, transgender, and queer (LGBTQ) personnel are able to serve in the armed forces of some countries around the world: the vast majority of industrialized, Western countries including some South American countries, such as Argentina, Brazil and Chile in addition to other countries, such as the United States, Canada, Japan, Australia, Mexico, France, Finland, Denmark and Israel. The rights concerning intersex people are more vague.
Margarethe "Grethe" Cammermeyer is a Norwegian-American former military officer. She served as a colonel in the Washington National Guard and became a gay rights activist.
McVeigh v. Cohen was a 1998 lawsuit in U.S. federal court in which a member of the U.S. Armed Forces challenged the military's application of its "Don't Ask, Don't Tell" (DADT) policy, which established guidelines for service by gays and lesbians in the U.S. military. The U.S. Navy sought to discharge Timothy R. McVeigh for declaring his homosexuality, which he had allegedly done via anonymous Internet posts. McVeigh's suit denied he had made such a declaration and charged the Navy with failure to adhere to its own DADT policy in the course of investigating him, while violating the Electronic Communications Privacy Act by collecting his private online communications.
Andrew Holmes v. California National Guard, 124 F.3d 1126 was a federal court case heard by the Ninth Circuit Court of Appeals, that upheld the "don't ask, don't tell" policy that restricted service by gays and lesbians in the California National Guard of the United States. The court decided that a member of the National Guard could not be discharged for saying publicly that he or she is homosexual or bisexual, but could be restricted to assignments that did not require recognition by the federal government.
Alan Greg Rogers was an ordained pastor, a U.S. Army major and intelligence officer, a civil rights activist in the gay, lesbian and bisexual military community and the first-known gay combat fatality of Operation Iraqi Freedom. The subsequent coverage of his death in the media sparked a debate over the effect of the military's "don't ask, don't tell" (DADT) policy and what information should be included in the biography of a gay military person killed in action.
Unfriendly Fire: How the Gay Ban Undermines the Military and Weakens America is an American 2009 political book by Nathaniel Frank that argues that the "Don't Ask, Don't Tell" policy banning openly gay servicemen and women from the United States armed forces weakened military and national security. According to Frank, 12,000 people — 800 of whom had previously been deemed "mission critical" by the U.S. government — were discharged from the military between 1993 and 2008, based on policies that Frank describes as "rooted in denial, and deception, and repression."
The United States military formerly excluded gay men, bisexuals, and lesbians from service. In 1993, the United States Congress passed, and President Bill Clinton signed, a law instituting the policy commonly referred to as "Don't ask, don't tell" (DADT), which allowed gay, lesbian, and bisexual people to serve as long as they did not reveal their sexual orientation. Although there were isolated instances in which service personnel were met with limited success through lawsuits, efforts to end the ban on openly gay, lesbian, and bisexual people serving either legislatively or through the courts initially proved unsuccessful.
Log Cabin Republicans v. United States, 658 F.3d 1162 was a federal lawsuit challenging the constitutionality of 10 U.S.C. § 654, commonly known as don't ask, don't tell (DADT), which, prior to its repeal, excluded homosexuals from openly serving in the United States military. The Log Cabin Republicans (LCR), an organization composed of lesbian, gay, bisexual, and transgender (LGBT) Republicans, brought the suit on behalf of LCR members who serve or served in the military and were subject to DADT.
Servicemembers United (SU) was an LGBT-interest organization dedicated to the repeal of the United States armed forces' gay-exclusionary policy, commonly known as "don't ask, don't tell" (DADT). The organization, formerly known as "Call to Duty", formed in 2005 by veterans.
Witt v. Department of the Air Force, 527 F.3d 806 is a federal lawsuit that challenged the constitutionality of 10 U.S.C. § 654, the law, since repealed, that excluded openly homosexual people from serving in the United States military, commonly known as "Don't ask, don't tell" (DADT). The United States Court of Appeals for the Ninth Circuit ruled in 2008 that under Lawrence v. Texas DADT constitutes an "[attempt] to intrude upon the personal and private lives of homosexuals" and it is subject to "heightened scrutiny", meaning that the government "must advance an important governmental interest, the intrusion must significantly further that interest, and the intrusion must be necessary to further that interest."
The Don't Ask, Don't Tell Repeal Act of 2010 is a landmark United States federal statute enacted in December 2010 that established a process for ending the "don't ask, don't tell" (DADT) policy, thus allowing gay, lesbian, and bisexual people to serve openly in the United States Armed Forces. It ended the policy in place since 1993 that allowed them to serve only if they kept their sexual orientation secret and the military did not learn of their sexual orientation, which was controversial.
Josh Seefried is an LGBT rights activist, a former captain in the United States Air Force, and a former co-chairman on the Board of Directors of OutServe-SLDN, an association of lesbian, gay, bisexual and transgender members of the U.S. Military. A graduate from the U.S. Air Force Academy in 2009, Josh was formerly known by his pseudonym JD Smith during his campaign to end the discrimination against lesbians, gays and bisexuals serving openly in the United States military.
Collins v. United States is a class-action lawsuit filed on November 10, 2010, against the United States in the United States Court of Federal Claims that ended in a settlement on January 7, 2013.
Dan Choi is an American former infantry officer in the United States Army who served in combat in the Iraq War during 2006–2007. He became an LGBT rights activist following his coming out on The Rachel Maddow Show in March 2009 and publicly challenged America's Don't Ask, Don't Tell policy, which forbade lesbian, gay and bisexual (LGB) service members from serving openly.
American Veterans for Equal Rights (AVER) is the oldest Lesbian, Gay, Bisexual and Transgender (LGBT) Veterans Service Organization (VSO) in the United States. Founded in 1990, AVER is a non-profit VSO that supports and advocates for the rights of LGBT military veterans, active duty service members, and their families.
The topic of same-sex unions and military service concerns the government treatment or recognition of same-sex unions who may consist of at least one servicemember of a nation's military.
The legal and regulatory history of transgender and transsexual people in the United States begins in the 1960s. Such legislation covers federal, state, municipal, and local levels, as well as military justice. It reflects broader societal attitudes which have shifted significantly over time and have impacted legislative and judicial outcomes.
In the past most lesbian, gay, bisexual, transgender, and queer (LGBTQ) personnel had major restrictions placed on them in terms of service in the United States military. As of 2010 sexual orientation and gender identity in the United States military varies greatly as the United States Armed Forces have become increasingly openly diverse in the regards of LGBTQ people and acceptance towards them.
This overview shows the regulations regarding military service of non-heterosexuals around the world.
United States 
United States Air Force