U.S. Marines with Regimental Combat Team 5, do exercises to ensure their M50 gas masks are working properly while training at Enhanced Mojave Viper May 25, at Marine Air-Ground Training Center Twentynine Palms, Calif. The Marines are conducting chemical, biological, radiological, and nuclear training to complete the Marine Corps annual training requirements, and in preparation for RCT-5's upcoming deployment to Helmand province, Afghanistan. As the first regimental combat team to participate in EMV, RCT-5 will fine tune its command and control capabilities during this combined arms exercise.