JOINT BASE ELMENDORF-RICHARDSON, Alaska -- Sgt. George Lee, 1st Squadron (Airborne), 40th Cavalry Regiment, analyzes a crater March 31. Members of the regiment engaged in hands-on training on how to analyze a crater to learn what type of munition created it; where the munition came from; whether it was a high-angle or low-angle shot; and approximately from how far away the shot was taken. (U.S. Air Force photo/Senior Airman Christopher Gross)