US Air Force SENIOR AIRMAN Ivin Osores, Air Force Space Command, fires an M16A2 rifle downrange at pop-up targets while US Air Force SENIOR AIRMAN James Peck, 16th Security Forces Squadron of Hurlburt Field, Florida, stands over and evaluates him during the combat rifle competition at Camp Bullis, Texas, during DEFENDER CHALLENGE 2000. Defender Challenge is the annual Air Force wide competition sponsored by Air Force Security Forces. This competition showcases the talents and capabilities of 13 international Security Forces teams in seven physical fitness, base defense and policing skills over six days