STAFF SGT. Manuel Segura, Space Command, aims an M-16A1 rifle equipped with an M-203 grenade launcher during exercise Peacekeeper Challenge. Teams representing the best of more than 50,000 Air Force security police on duty at more than 455 worldwide locations take part in the annual exercise. Competitive events include physical fitness, combat rifles, combat tactics, handgun, machine gun, grenade launcher, accident investigation, crime scene search and investigation, military working dog and information security