Tech. Sgt Christopher Netzel of the 137th Space Warning Squadron completes his push-ups during his annual physical training (PT) June 10, 2009, Ellsworth Air Force Base, South Dakota. Netzel along with other members of the 137th SWS located in Greeley Colorado, are participating in several training events to include there PT test while at Ellsworth AFB this week to further enhance their one of a kind worldwide capable mission as a missile warning , space launch and detection mobile unit. (U.S Air Force photo by: Tech. Sgt. Wolfram M. Stumpf/Released)