Airman First Class Samuel Mericle, 79th Aerospace Medicine Squadron bioenvironmental technician, hands Staff Sgt. Thomas Scheide, 316th Security Forces Squadron patrol leader, an appointment letter for a gas mask fit test during a mobility exercise Nov. 5. There were three different elements to the exercise to include, cargo marshalling, mobility readiness and processing through the Installation Deployment Readiness Cell. (U.S. Air Force photo by Senior Airman Renae Kleckner)