US Air Force (USAF) AIRMAN First Class (A1C) Logan Davis, assigned to the 341st Space Wing (SW) ßFrontiersmen,ß from Malmstrom Air Force Base (AFB), Montana (MO), makes his way over the"Balancing Logs"during the Obstacle Course competition at Vandenberg Air Force Base (AFB) California (CA), during Exercise GUARDIAN CHALLENGE 2002. Guardian Challenge, a four-day space and missile competition, is hosted annually at Vandenberg AFB, CA to test the wartime readiness of Air Force Space Command (AFSPC) professionals