Staff Sgt. Paul, left, crew chief, and Airman 1st Class Casey, avionics specialist, verify operation of the Identification Friend or Foe system on a RQ-4 Global Hawk at an undisclosed location in Southwest Asia Mar. 7, 2015. A transponder is used to send a signal that requests the aircraft’s identification and the aircraft sends a signal back verifying the test was successful. Paul is currently deployed from Grand Forks Air Force Base, N.D., and is a native of Pittsburgh, Pa. Casey is currently deployed from Grand Forks Air Force Base, N.D. (U.S. Air Force photo/Tech. Sgt. Marie Brown)