Lt. Col. Michael Koval, outgoing commander for 90th

Lt. Col. Michael Koval, outgoing commander for 90th Troop Command Aviation Battalion, Oklahoma Army National Guard, delivers his parting words to fellow Soldiers during a change of command ceremony with incoming commander, Lt. Col. Robert Walker at the 45th Infantry Division Museum in Oklahoma City, October 22, 2016. 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)