Japan's Air-to-Air Upgrade AW&ST, Feb 24, 2012 By Bradley Perrett Tokyo Japan already has bought Raytheon AIM-120 Amraams, so why is it spending ¥36 billion ($468 million) to upgrade about 60 F-2 fighters with the Mitsubishi Electric Corp. AAM-4B missile? Although the benefits to Japanese industry are obvious, details of the upgrade and the missile itself suggest that the..