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Don’t Ask, Don’t Tell (DADT), by name for the former official U.S. policy (1993–2011) regarding the service of homosexuals in the military. Bill Clinton in 1993 signed a law (consisting of statute, regulations, and policy memorandum) directing that military personnel “don’t ask, don’t tell, don’t pursue, and don’t harass.”October 1, 1993, the policy theoretically lifted a ban on homosexual service that had been instituted during World War II.In December 2010 both the House of Representatives and the Senate voted to repeal the policy, and Pres. Barack Obama signed the legislation on December 22. The policy officially ended on September 20, 2011.