Photos Of The Day Best Photos Of The Week A.S. 0 Osan Air Base, Republic of Korea US Air Force Staff Sgt. Sammy McCain is taking off his helmet during a test to see how the US would respond in case of a chemical attack. Photo: Ashley Tyler/Courtesy US Air Force/Reuters Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 <1 ... 56 7 89 ... 21>