F-4E Phantom IIF 4E Phantom II airplane model. The F 4E Phantom is essentially an F 4D with upgraded J79 GE 17 engines, providing 900 lbs. more static sea level thrust each, and equipped with a M61A1 "Vulcan" 20mm cannon. Lessons learned from Vietnam directly influenced the cannon's addition due to low air to air missile fire to hit ratios and frequent subsonic 'dogfights,' where the F 4 was less maneuverable than enemy aircraft like the MiG 17 and MiG 21. To reduce