Chief Master Sgt. Joseph Thornell (center), Air Forces Northern command chief, passes his coin to Lt. Gen. Sid Clarke Sept. 8 as Chief Master Sgt. Mitchell Brush watches on and prepares to accept the coin from Clarke, symbolizing his assumption of responsibility of the command’s enlisted force. Thornell came on board as AFNORTH command chief in December 2009 and is transferring to Fresno, Calif., where he will serve as the command chief of the 144th Fighter Wing. (U.S. Air Force photo by Susan Trahan)