Colonel Michael Mongold, 628th Mission Support Group commander passes the guidon to Lt. Col. Matthew Brennan, the new 628th Civil Engineer Squadron commander during a change of command ceremony July 10, 2015 at Joint Base Charleston, S.C. Brennan comes to JB Charleston from Headquarters Air Force in Washington, D.C., where he was the executive officer for the Directorate of Civil Engineers, assumed command from Lt. Col. Patrick Miller. Miller is headed to Washington, D.C., where he will attend The National War College. (Courtesy photo)