Capt. Nicholas Schade Whitlock, 29, died Feb. 18, 2012, while serving in the U.S. Air Force in Africa. Whitlock and three comrades died in an accident near Camp Lemonnier, Djibouti. He was serving on his fifth deployment, and the accident occurred while the aircraft was returning from a mission in support of Operation Enduring Freedom. (U.S. Air Force graphic by Tommie Horton)