Note the Arleigh Burke Class Destroyers behind the carriers. Those bad boys provide Theatre Missle Defense for the US (and Canada, Derf). The name of the operation: Exercise Valiant Shield 2006.
This is a training excersise but I really want to read between the lines. And then there's this in one of the press releases:
The U.S. routinely deploys forces to the Western Pacific to maintain a stabilizing presence in the region. Valiant Shield along with exercises like Northern Edge and Terminal Fury will help ensure that Airmen are prepared and ready to immediately help a joint team response to any contingency.