Col. Gina Humble, 11th Operations Group commander, passes the U.S. Air Force Honor Guard guidon to incoming commander, Lt. Col. Timothy Thurston, during an assumption of command at Joint Base Anacostia Bolling’s ceremonial lawn, May 21, 2013. The Assumption of Command ceremony marks a formal passing of responsibility, authority, and accountability of command. (U.S. Air Force photo/Airman 1st Class Aaron Stout)