Article Photos: AP IMPACT: An insider attack: Trust cost 2 lives 3/3

This undated photo provided by Fort Carson(Colo.) shows Army Capt. Joshua Lawrence. U.S. Army Capts. Lawrence and Drew Russell were inside a small command post on an Afghan army base, when an exploding grenade was followed in seconds by bursts of gunfire. Before any of the Americans could raise a hand to defend themselves, Lawrence was dead, one 5.56mm bullet to the head, and Russell was dying, shot three times in the back. (AP Photo/Fort Carson)