Chief Master Sgt. Bob Wright, 4th Air Force aircrew flight equipment functional manager, gives a safety briefing to members of 4th Air Force prior to a farewell motorcycle ride for Maj. Gen. Eric W. Crabtree, 4th Air Force commander, at March Air Reserve Base, Calif., March 9, 2011. Members of 4th Air Force organized the ride as a way to say goodbye to General Crabtree, who will be taking a new assignment at the Defense Threat Reduction Agency, Ft. Belvoir, Va. (U.S. Air Force photo/2nd Lt. Zach Anderson)