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Capt. Robert MacArthur talks with an Airman June 5, 2014, at the 60th Dental Squadron clinic at Travis Air Force Base, Calif. A gay man, MacArthur stayed in the closet during the armed forces' 17-year observance of "Don't Ask, Don't Tell." MacArthur is a 60th Dental Squadron dentist and the president of the Travis AFB Lesbian, Gay, Bisexual and Transgender Alliance. (U.S. Air Force photo/Staff Sgt. Christopher Carranza)