SCRUB DOWN Emergency personnel receive a scrub down during a training exercise on Selfridge Air National Guard Base, Mich., June 5, 2015. During the exercise, a smoke machine created a simulated cloud of chlorine gas. Airmen on the base train annually to respond to local emergencies and deploy to forward locations. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 517645-X-SCH77-107.jpg Photo Gallery