He appears to be referring to West Point cadets as Obama's "enemy camp," politically speaking, based on skeptical looks in the audience and the absence of lots of cheering. To be fair, the audience is quiet partly because it's a highly disciplined group of cadets accustomed to following strict protocol and getting punished for violating it, so not a lot of applause was to be expected, necessarily. At any rate, here's Chris Matthews in a truly bizarre rhetorical moment: