Sterling Achievement An airman carries challenge coins during the 737th Training Group coin and retreat ceremony at Joint Base San Antonio, March 19, 2025. The ceremony is one of three graduation events for the Air Force's Basic Military Training, signifying the transition from trainee to airman. SHARE: Download: Full Size (1.62 MB) Tags: Air Force Credit: Air Force 2nd Lt. Kate Anderson VIRIN: 250319-F-LV958-1051K.JPG Photo Gallery