A captured young fighter of the Islamic State (also known as ISIL, ISIS, and Daesh) was being treated by a medic. According to two SEAL witnesses, Gallagher said over the radio „he’s mine“ and walked up to the medic and prisoner, and without saying a word killed the prisoner by stabbing him repeatedly with his hunting knife. Gallagher and his commanding officer, Lieutenant Jake Portier, then posed for photos of them standing over the body with some other nearby SEALs. Gallagher then text messaged a fellow SEAL a picture of the dead captive with the explanation „Good story behind this, got him with my hunting knife.”
Another accusation was that Gallagher’s sniper work during his 2017 deployment became indiscriminate, reckless, and bloodthirsty. He allegedly fired his rifle far more frequently than other snipers; according to testimony, the other snipers in the platoon did not consider him a good sniper, and he took „random shots“ into buildings. Other snipers said they witnessed Gallagher taking at least two militarily pointless shots, shooting and killing an unarmed old man in a white robe as well as a young girl walking with other girls. Gallagher allegedly boasted about the large number of people he had killed, claiming he averaged three kills a day over 80 days, including four women. Gallagher also was reportedly known for indiscriminately spraying neighborhoods with rockets and machine gun fire with no known enemy force in the region.
A charge of obstruction of justice was brought against Gallagher for alleged witness intimidation. According to the claim, Gallagher allegedly threatened to kill fellow SEALs if they reported his actions.