The fierce aerial battles that became synonymous with the 1972-73 Linebacker offensive over North Vietnam saw the USAF's F-4 Phantom II crews claim 48 MiG-19s and MiG-21s destroyed. Although the USAF had introduced few initiatives to update the Phantom II's missiles and improve tactics since Rolling Thunder had come to an end four years earlier, it did deploy the gun-armed F-4E, and its 20mm cannon scored seven kills. Other electronic modifications...