Investigators said Gibbs, 25, hatched a plan with another soldier, Jeremy Morlock, 22, and other members of the unit to form a "kill team". While on patrol over the following months they allegedly killed at least three Afghan civilians. According to the charge sheet, the first target was Gul Mudin, who was killed "by means of throwing a fragmentary grenade at him and shooting him with a rifle", when the patrol entered the village of La Mohammed Kalay in January.
Morlock and another soldier, Andrew Holmes, were on guard at the edge of a poppy field when Mudin emerged and stopped on the other side of a wall from the soldiers. Gibbs allegedly handed Morlock a grenade who armed it and dropped it over the wall next to the Afghan and dived for cover. Holmes, 19, then allegedly fired over the wall.
Later in the day, Morlock is alleged to have told Holmes that the killing was for fun and threatened him if he told anyone.
The second victim, Marach Agha, was shot and killed the following month. Gibbs is alleged to have shot him and placed a Kalashnikov next to the body to justify the killing. In May Mullah Adadhdad was killed after being shot and attacked with a grenade.