HANSCOM AIR FORCE BASE, Mass. -- Second Lt. Wesley Thomas demonstrates counter-improvised explosive device technologies developed here to Air Force Chief of Staff Gen. Mark A. Welsh III, Gen. Janet Wolfenbarger, commander of Air Force Materiel Command, and U.S. Reps John Tierney and Niki Tsongas of Massachusetts Nov 8, 2013. (U.S. Air Force photo/Walter Santos)