Senior Airman Eric Sawyer of the 11th Wing Team scales the net of the first of 21 obstacles of the Chief's Challenge during Defender Challenge '99 at Lackland Air Force Base, Texas, on Nov. 6, 1999. Defender Challenge is an all-star competition featuring Security Forces from Air Force major commands and the Royal Air Force Regiment. Teams compete in a fitness challenge, handgun events, combat rifle, combat weapons and nighttime tactical events. The Chief's Challenge, a head-to-head competition on the obstacle course, is the only individual event in Defender Challenge.