Army Lt. Col. Tim Peterman, Squadron Commander of 2nd Squadron, 14th Calvary Regiment, 2nd Infantry Brigade Combat Team, 25th Infantry Division validates the fifteen-degree rule with one of his Trooper's during a Combined Arms Live Fire Exercise (CALFEX) at Pohakuloa Training Area, Hawaii, May 15, 2018. The CALFEX utilizes all the enablers available to the unit in order to increase interoperability, concentrate combat power and mass effects on the objective. ( Army photo by 1st Lt. Ryan DeBooy)

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Keywords: 14, 25th, 2nd, air, armes, assault, calfex, cavalry, combined, division, exercise, fire, hawaii, id, infantry, landing, lightning, live, m4, pta, ranger, regiment, security, squadron, tropic, uh-60, zone