FORT HOOD, Texas (AP) — Somberly reciting 13 names and 13 stories, President Obama saluted the Americans killed at this Army post as heroes who died for their country — and promised a nation demanding answers that “the killer will be met with justice.”Addressing a hushed crowd of thousands of soldiers Tuesday, the president spoke forcefully if indirectly of the alleged shooter’s motives in last week’s massacre, never mentioning Maj. Nidal Hasan by name.”It may be hard to comprehend the twisted logic that led to this tragedy,” Obama said. “But this much we do know: No faith justifies these murderous and craven acts.”