U.S. wants super-bunker busters that could destroy Iran nuke sites

Geostrategy - Direct.com:

The United States wants to develop the capability to destroy Iranian nuclear facilities in air strikes. Officials said the need for U.S. capability to destroy underground nuclear facilities has spurred the renewal of the effort to create so-called super-bunker busters. Defense Secretary Donald Rumsfeld issued the request for the weapon, termed Robust Nuclear Earth Penetrator, in a letter sent to then-Energy Secretary Spencer Abraham in January.