Oklahoma Guardsman Lt. Col. Michael Koval (left), outgoing

Oklahoma Guardsman Lt. Col. Michael Koval (left), outgoing commander for the 90th Troop Command Aviation Battalion, hands off the unit colors to Col. John Zenker (right), commander of 90th Troop Command, Oklahoma Army National Guard (OKARNG), during a change of command ceremony between Koval and incoming commander, Lt. Col. Robert Walker, October 22, 2016 at the 45th Infantry Division Museum in Oklahoma City. The change of command not only brings in a new commander, but also a new mission. As of Oct. 1 of this year, 90th Troop Command’s Aviation Battalion, now known as 2nd Battalion, 245th Aviation Regiment (Fixed Wing), oversees all Fixed Wing detachments and companies in each state throughout the Army National Guard. (U.S. Army National Guard photo by Sgt. Bradley Cooney)