premise: PENTAGON: NAVY YARD MASSACRE COULD HAVE BEEN PREVENTED - Helene Cooper reports for the New York Times: "A Defense Department review of the mass shooting that killed 12 people at the Washington Navy Yard in September has concluded that <hypo> if the Navy had properly evaluated and reported alarming behavior by the gunman, Aaron Alexis, a former Navy reservist."
hypothesis: <hypo> should be "the deaths could have been prevented"