McDonnell Douglas YC-15

YC-15
Second YC-15 prototype in flight
Role	Tactical airlifter Type of aircraft
National origin	United States
Manufacturer	McDonnell Douglas
First flight	26 August 1975
Status	Replaced and eventually became the C-17
Number built	2
Developed into	Boeing C-17 Globemaster III

The McDonnell Douglas YC-15 is a replaced prototype four-engine short take-off and landing (STOL) tactical transport. It was McDonnell Douglas' entrant into the United States Air Force's Advanced Medium STOL Transport (AMST) competition to replace the Lockheed C-130 Hercules as the USAF's standard STOL tactical transport. In the end, neither the YC-15 nor the Boeing YC-14 was ordered into production, although the YC-15's basic design would be used to form the successful McDonnell Douglas (later Boeing) C-17 Globemaster III.