According to Defense Tech : "... 500-pound GBU-38 -- half the size of what had been the smallest Joint Direct Attack Munition, [JDAM] or satellite-directed bomb. F-16s at Balad Air Base in Iraq are now being loaded up with the bombs. The U.S. Air Force hopes to "hopes within days" to begin using them, according to Defense News. [...] The Air Force is [also] developing an even smaller weapon, the 250-pound Small Diameter Bomb. [The] weapon will bring not only a more measured use of explosive power, but the ability to load more bombs on a fighter, expanding the number of targets that can be hit in a single sortie."