9/8/2011 - Staff Sgt. Nicole Powell, 374th Airlift Wing command chief executive assistant, signs in at the 374th Logistics Readiness Squadron supply warehouse equipment building at Yokota Air Base, Japan, Sept. 6, 2011. Sergeant Powell exchanged her individual protective equipment for an upcoming exercise. (U.S. Air Force photo/Airman 1st Class Krystal M. Garrett)

9/8/2011 - Senior Airman Daniel Vega, 374th Logistics Readiness Squadron supply technician, measures Capt. Michael Emery, 459th Airlift Squadron executive officer, for an M-50 protective mask at Yokota Air Base, Japan, Sept. 6, 2011. Airmen exchanged their old individual protective equipment for new gear to prepare for a phase II operational readiness exercise. (U.S. Air Force photo/Senior Airman Andrea Salazar)

9/8/2011 - Capt. Michael Emery, 459th Airlift Squadron executive officer, tries on individual protective equipment at the 374th Logistics Readiness Squadron supply warehouse at Yokota Air Base, Japan, Sept. 6, 2011. Captain Emery was issued new gear in preparation for Yokota's upcoming operational readiness exercise. (U.S. Air Force photo/Senior Airman Andrea Salazar)

9/8/2011 - Yokota members exchange old individual protective equipment for new gear in preparation for a phase II operational readiness exercise at Yokota Air Base, Japan, Sept. 6, 2011. (U.S Air Force photo/Senior Airman Andrea Salazar)

9/8/2011 - An Airman disassembles his old MU-2 protective mask to exchange it for new equipment in preparation for an upcoming phase II operational readiness exercise at Yokota Air Base, Japan, Sept. 6, 2011. (U.S. Air Force photo/Airman 1st Class Krystal M. Garrett)