The repeal of the Don't ask, don't tell policy, the 17-year-old policy banning homosexuals serving openly in the United States military, is signed into law by President Barack Obama.

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.

"Don't ask, don't tell" (DADT) was the official United States policy on military service of homosexual 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".

Barack Hussein Obama II is an American politician who was the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the first African American president. Obama previously served as a U.S. senator representing Illinois from 2005 to 2008 and as an Illinois state senator from 1997 to 2004.