March 7, 2018 The “Cadillac of medevac”: The C9A’s lasting mark on the aeromedical evacuation system Making its debut in August of 1968, the C-9A was the U.S. Air Force’s first specially designed aeromedical evacuation aircraft. The C-9A answered the increased demand for effective aeromedical patient transport as U.S. involvement in the Vietnam War escalated.