U.S. Air Force Brig. Gen. Gregory Guillot, 55th Wing commander hands the unit guidon to Col. Ryan Rogers as he takes command of the 55th Electronic Combat Group at Davis-Monthan Air Force Base, Ariz., May 27, 2015. The 55th ECG commander is responsible for five squadrons of more than 700 Airmen to provide combat-ready EC-130H Compass Call aircraft, aircrew and maintainers for worldwide expeditionary deployment in support of unified combatant commanders. (U.S. Air Force photo by Airman 1st Class Chris Massey/Released)