What it is: http://www.globalsecurity.org/wmd/ops/divine-strake.htm
Pentagon lying to Congress: http://www.washingtonpost.com/wp-dyn/content/article/2006/04/06/AR2006040601916.html
(Note the last two paragraphs - "yeah, it's the same program we were going to do before, to see how a nuclear warhead could be used.. oops, did we say nuclear? Sorry, no, it's exactly the same, only different.. Yeah, that's the ticket..")
Duck and cover.