One of the most significant events in the history of the Academy was the admission of women.   On 7 October 1975, President Gerald R. Ford signed legislation permitting women to enter the United States service academies. On 26 June 1976, 157 women entered the Air Force Academy with the Class of 1980. Because there were no female upper class cadets, the Air Training Officer model used in the early years of the Academy was revived, and fifteen young female officers were brought in to help with the integration process. The female cadets were initially segregated from the rest of the Cadet Wing but were fully integrated into their assigned squadrons after their first semester. On 28 May 1980, 97 of the original female cadets completed the program and graduated from the Academy—just over 10% of the graduating class. Women have made up just over 20% of the most recent classes, with the class of 2016 having the highest proportion of any class, 25%.