Royal Air Force Regiment's Corporal Antony Doherty (Grenadier and kneeling) and Flight Lieutenant Kristian Cressy (M16 rifleman and lying down) fire at targets down range as an evaluator looks on during the combat weapons competition of DEFENDER CHALLENGE 2000 at Camp Bullis, Texas. 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