Geraldine Hamilton Sloan Truhill (November 12, 1929 – November 18, 2013)[1] was an American aviator. She was part of the Mercury 13, the group of women who underwent the same physiological tests as the Mercury Seven during the same time frame. She served as the Vice President for Air Freighters International and Air Services, Inc. Truhill died on November 18, 2013.[2]