The Air Force is delaying a key acquisition milestone for Raytheon's $4.5 billion Small Diameter Bomb II program, pushing the target date for initial fielding of the new weapon on both naval variants of the Joint Strike Fighter due to a schedule slip stemming from the F-35 joint program office's effort to formalize the Block 4 package of capabilities for the new stealth fighter. On Nov. 28, the Defense Department relayed to Congress -- on behalf of the Air Force...