Air Mobility Command's mission is to provide global air mobility. The command also plays a crucial role in providing humanitarian support at home and around the world. AMC Airmen – active duty, Air National Guard, and Air Force Reserve, augmented by the civilian airliners and flight crews of the Civil Reserve Air Fleet (CRAF) – provide airlift and aerial refueling for all of the United States' armed forces. Many special duty and operational support aircraft (OSA) and stateside aeromedical evacuation missions are also assigned to AMC.