I was wrong. Per CNN:
One dead suspect has been identified as Aaron Alexis, a 34-year-old military contractor from Texas, the FBI said. One other gunman may be on the loose, police said. Developments below:
It doesn’t appear to be foreign terrorism, but the home-grown mass shooting kind of terrorism. I suppose he could still turn out to be a jihadist, but it’s looking unlikely. They’re still looking for one other possible shooter.