Covered in protective plastic while participating in a simulated chemical warfare exercise, a 303rd Fighter Squadron A-10 Thunderbolt II pilot leaves the flight line following a training mission during the 442nd Fighter Wing?s unit training assembly. The 442nd FW, an Air Force Reserve Command unit based at Whiteman Air Force Base, Mo., used the exercise to train its members to be able to continue to operate in all warfare environments. (US Air Force photo/Master Sgt. Bill Huntington)