In 2036, a civil war between pro-Russian insurgents and local resistances in Ukraine leads the US to deploy peacekeeping forces. During an operation, a team of US Marines and robotic soldiers, called "G.U.M.P."s, are ambushed. Disobeying an order, drone pilot Lt. Harp deploys a Hellfire missile in a drone strike against a suspected enemy launcher, killing two Marines caught in the killzone but saving the 38 Marines who would have been killed by the launcher. As punishment, Harp is redeployed to combat duty at Camp Nathaniel, the US base of operations in Ukraine. Harp is assigned to Capt. Leo, a highly advanced and experimental android super-soldier masquerading as a human officer, a secret known only by Harp and camp commander Col. Eckhart.