GRISSOM AIR RESERVE BASE, Ind., -- Master Sgt. Chet Nance, noncommissioned officer in charge of combat arms with the 434th Security Forces Squadron, demonstrates how to set up an M49A1 surface trip flare during a familiarization class held during a unit training assembly. (U.S. Air Force photo/Staff Sgt. Mark R.W. Orders-Woempner)