It’s hard to draw too many conclusions right now, but we do know this: Thursday night, authorities shot and then apprehended the lone suspect, Major Nidal Malik Hasan. A psychiatrist who was set to deploy to Iraq at the end of the month, Hasan reportedly opened fire around the “Readiness Center” at Fort Hood, where troops are prepared for deployments to Iraq and Afghanistan. And though this scene is a most extreme and tragic outlier, it comes at a time when the stress of combat has affected so many soldiers individually that it makes it increasingly difficult for the military as a whole to deploy for wars abroad.