311th Airlift Squadron departs Peterson
PETERSON AIR FORCE BASE, Colo. — Two pilots with the 311th Airlift Squadron perform preflight checks on their C-21A twin turbofan aircraft used for cargo and passenger airlift operations. This aircraft represents the final departure of the 311th from Peterson AFB and the Air Force after nine years of service. (U.S. Air Force photo/Michael Golembesky)