DALLAS (AP) — The Army reservist who killed five Dallas police officers had kept an unauthorized grenade in his room on an Afghanistan base in 2014, according to a report by Army officials investigating a sexual harassment complaint against him. Carrying an assault rifle, Johnson took multiple positions as he attacked police and threatened to kill more before a bomb-carrying robot was deployed to kill him, authorities have said. [...] his military career ended soon after a female soldier reported four pairs of panties missing while the two were at Camp Shank, a base in eastern Afghanistan known as "Rocket City" because the Taliban targeted it many times. If indeed he really had panties that belonged to her without her permission, that kind of pales in comparison to having an explosive device or to having someone else's medication. Nor have local or federal authorities detailed what led Johnson upon his return to the U.S.