More than 200 active duty, reserve, veteran and civilian women took part in an all-female retreat ceremony at the 60th Air Mobility Wing's headquarters at Travis Air Force Base, Calif., March 19, 2015. The ceremony, which marks the end of the military duty day, was part of the second annual National Women's History Project. Though not yet official, organizers of the ceremony aimed to make it the largest in American history. (U.S. Air Force photo/Ken Wright)