Women first joined the Air Force in 1948 when President Harry Truman signed the Women's Armed Services integration Act, which allowed women to serve in the military and created the Women in Air Force (WAF) program. This program allowed women to serve in very limited roles in the Air Force. In 1976 the program ended as women were accepted into the USAF on equal basis with men.
There were predecessors to the WAF. During WWII the Women's Auxiliary Ferrying Squadron (WAFS) and Women Airforce Service Pilots (WASPs) were formed. WAFS was a small group of transporter pilots while WASPs were, as their name suggests, pilots. These groups were integrated into the Air Force when women were admitted.