9/13/2011 - Airman 1st Class Jake Luckt (left) and Staff Sgt. Anthony Miller (right), both from the 374th Maintenance Squadron, set up an unexploded ordnance cordon at Yokota Air Base, Japan, Sept. 13, 2011 during a wing readiness exercise. (U.S. Air Force photo/Osakabe Yasuo)

9/13/2011 - Airman 1st Class Jake Luckt (left) and Staff Sgt. Anthony Miller (right), both from the 374th Maintenance Squadron, set up an unexploded ordnance cordon at Yokota Air Base, Japan, Sept. 13, 2011 during a wing readiness exercise. (U.S. Air Force photo/Osakabe Yasuo)

9/13/2011 - Staff Sgt. Anthony Miller (left) and Airman 1st Class Jake Luckt (right), both from the 374th Maintenance Squadron, set up an unexploded ordnance cordon at Yokota Air Base, Japan, Sept. 13, 2011 during a wing readiness exercise. (U.S. Air Force photo/Osakabe Yasuo)

9/13/2011 - The 374th Maintenance Squadron post attack reconnaissance team reports to the Unit Control Center after setting up an exploded ordnance cordon at Yokota Air Base, Japan, Sept. 13, 2011 during a wing readiness exercise. (U.S. Air Force photo/Osakabe Yasuo

9/13/2011 - Airmen from the 374th Maintenance Squadron evacuate from their facility in response to a simulated unexploded ordnance found at Yokota Air Base, Japan, Sept. 13, 2011 during a wing readiness exercise. (U.S. Air Force photo/Osakabe Yasuo)

9/13/2011 - Airmen from the 374th Maintenance Squadron evacuate from their facility in response to a simulated unexploded ordnance found at Yokota Air Base, Japan, Sept. 13, 2011 during a wing readiness exercise. (U.S. Air Force photo/Osakabe Yasuo)