Validating Position Army Lt. Col. Tim Peterman, rear, validates the 15-degree rule with one of his soldiers during a combined arms live-fire exercise at Pohakuloa Training Area, Hawaii, May 19, 2018. Peterman is commander, 25th Infantry Division’s 2nd Squadron, 14th Cavalry Regiment, 2nd Infantry Brigade Combat Team. Army photo by 1st Lt. Ryan DeBooy SHARE: Download: Full Size (2.26 MB) Credit: 1st Lt. Ryan DeBooy VIRIN: 180519-A-NH731-035A.JPG Photo Gallery