CNN reports on the US Military blocking high internet traffic sites in the Pacific fleet.

U.S. military blocks websites to help Japan recovery efforts

By Mark Preston and Adam Levine, CNN
March 15, 2011 9:02 p.m. EDT

Several websites, including YouTube, have been blocked from U.S. military computers in Japan to free bandwidth for recovery efforts.
STORY HIGHLIGHTS

YouTube, ESPN, eBay among popular websites blocked on military computers
Effort is intended to free up bandwidth for use in helping Japan
Blockage is temporary and subject to change, Strategic Command says

Washington (CNN) -- The U.S. military has blocked access to a range of popular commercial websites in order to free up bandwidth for use in Japan recovery efforts, according to an e-mail obtained by CNN and confirmed by a spokesman for U.S. Strategic Command.

CNET also reports on the same activity pointing to CNN.

With satellite communication on the US Pacific Fleet, images, video and documents can be sent from North Eastern Japan to data centers in Japan or anywhere else in the world.

You could think of the US Pacific Fleet as a mobile floating ISP, and they need to provide as much bandwidth as possible for the emergency efforts vs. the entertainment and shopping of the crew.