Capt. Thomas Armstrong, a student with the 458th Airlift Squadron's C-21A formal training unit, checks his pre-flight checklist prior to take-off April 6, 2011, at Scott Air Force Base, Ill. Captain Armstrong was part of the initial qualification course under the 458th AS after it regained the C-21 training mission from the 45th AS at Kessler AFB, Miss. Upon completion of his training, Captain Armstrong will fly out of Ramstein Air Base, Germany. (U.S. Air Force Photo/Staff Sgt. Brian J. Valencia)