Lt Gen Charles Stenner, Chief of the Air Force Reserve, from the left, Maj Gen Robert Duignan, and Brig Gen Eric Crabtree stand at attention during the posting of Colors. Brigadier General Eric W. Crabtree assumed command of 4th Air Force from Major General Robert E. Duignan 25 January 2009 during Change of Command ceremonies at March Air Reserve Base, California. Retirement Ceremonies for Maj Gen Duignan followed the change of command. U.S. Air Force Photo by Master Sgt Rick Sforza (RELEASED)