The AGM-122 "Sidearm" anti-radiation missile (ARM) is one of the more obscure operational missile systems within the annals of air combat history, but how it came to be was pretty creative and we probably could use something very similar to it today. The history of the legendary Sidewinder air-to-air missile reads like alphabet soup, with dozens of variants carrying different letter designations, all of which were designed, tested, and in many cases deployed operationally over the last six decades. These have included a surface-to-air variant, the MIM-72, that equipped the M48 Chaparral short-range mobile air defense system, the air-to-ground AGM-87...