http://today.reuters.com/news/newsArticle.aspx?type=technologyNews&storyID=2005-03-30T203719Z_01_N30176011_RTRIDST_0_TECH-ARMS-MISSILE-USA-DC.XML
The United States is readying an ultra-sophisticated radar system to float slowly around the world to Alaska where it will play a key role in a multibillion-dollar project to shoot down incoming ballistic missiles.
The platform's on-board propulsion system makes it possible to operate it in oceans around the world, the Missile Defense Agency said in a statement last week.