2010 Guardian Challenge kicks off
VANDENBERG AIR FORCE BASE, Calif. -- With the clock slowly ticking away, Airman 1st Class Ronald Smith, a 30th Security Forces Squadron member, participates in the Guardian Challenge Push-up/Sit-up Contest here Friday, Feb. 5, 2010. The Guardian Challenge is the world’s premier space and cyberspace competition. (U.S. Air Force photo/Airman 1st Class Kerelin Molina)