TACTICAL TRAINING Airman 1st Class Lee Olson keeps watch during a simulated gas attack while participating in the Expeditionary Combat Skills Training at Charleston Air Force Base, S.C., Dec. 7. The tactical operations course helps prepare Charleston airmen for future deployments. Olson is with the 437th Medical Group. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 490405-P-RXM84-732.jpg Photo Gallery