sentences:  Two years later, Hale is promoted to Lieutenant and given command of Echo Squad, consisting of Sergeant Ben Warner, Specialist Aaron Hawthorne, and Corporal Joseph Capelli.On May 15, 1953, a Chimeran armada launches an invasion of the United States, overwhelming most of its remaining populated cities.Among the targets is an underwater SRPA outpost in San Francisco, where Hale is scheduled to undergo inhibitor treatment to prevent the Chimera virus completely taking him over.