Don't ask, don't tell
Prior to 1993, lesbian and gay people were not permitted to serve in the U.S. military. Under the "Don't ask, don't tell" (DADT) policy enacted that year, they were permitted to do so only if they did not disclose their sexual orientation. The Don't Ask, Don't Tell Repeal Act of 2010 permitted homosexual men and women to serve openly in the armed forces once designated government officials certified that the military was prepared for the repeal. Since September 20, 2011, gays, lesbians, and bisexuals have been able to serve openly.