Technical Sergeant Dal Lent, USAF, 92nd Security Forces Squadron, signals an "op-four" (bad-guys) team member during the security forces tactics competition. He is wearing MILES (Multiple Integrated Laser Engagement System) gear as headgear. GUARDIAN CHALLENGE, the world's premier space and missile competition, is a four-day event hosted annually at Vandenberg AFB, CA "to recognize the best and demonstrate the commands warfighting skills. GUARDIAN CHALLENGE creates competition-tough crews; improves readiness and combat capabilities through preparation, innovation and sharing; enhances esprit de corps and strengthens teamwork across all mission areas in the command."