U.S. Air Force Staff Sgt. Travis Martinez, 31st Aircraft Maintenance Squadron dedicated crew chief, guides a U.S. Air Force F-16 Fighting Falcon with a TowFLEXX during exercise Thracian Viper 20, Sept. 24, 2020, at Graf Ignatievo Air Base, Bulgaria. A TowFLEXX is a remote-controlled system designed to tow an aircraft. During Thracian Viper 20, Airmen are testing the operability and capability of the TowFLEXX. (U.S. Air Force photo by Airman 1st Class Ericka A. Woolever)