Airmen from the 49th Wing gear up into level four mission-oriented protective posture during a Phase II Field Training Exercise at Holloman Air Force Base, N.M., Dec. 5. MOPP gear is designed to help protect against chemical and biological warfare. The 3-day exercise reinforced combat readiness and evaluated mission effectiveness in deployed situations. (U.S. Air Force photo by Airman 1st Class Michael Shoemaker/Released)