Starting in 1973 the Japan Air Self-Defense Force received 154 F-4EJ Phantoms that were based on the USAF F-4E. 138 of these aircraft were manufactured under license by Mitsubishi who produced the last F-4 Phantom II. Several changes were made to the F-4E to make it an F-4EJ. Basically it had any offensive weapons removed but eventually these restrictions were lifted and the aircraft were updated with missiles and the latest electronic equipment.
The first F-4 arrived at Hyakuri AB assigned to the 301st Hikotai “Samurai” in 1972. The 301st Hikotai is the last JASDF F-4EJ squadron and in 2020 to celebrate the F-4 retirement, two F-4EJs were given special paint schemes. F-4EJ 315 37-8315 wore the words “Go for it!! 301 Sq.”, while 07-8436 wore blue, cyan, white and black bands on top as well as “Phantom Forever” on the fuselage. “Thank You Phantom II” and “1971-2020” were displayed on the upper wings. Both aircraft wore the 301st Frog emblem on the tail.
Specifications for the F-4E Phantom II / F-4EJ
They are virtually identical except for the restricted equipment: This included removal of the in-flight refueling receptacle that was later retrofitted, no leading edge slats, ground attack control equipment such as weapons and bomb delivery systems and the addition of modern electronic equipment including a data link system and radar warning receiver. Most or all this equipment was eventually reinstalled.

Number Built: F-4E - 5,195 / F-4EJ - 154 with 138 built in Japan under license.
Interesting trivia: Each aircraft has 54,197 feet of wiring and 643,000 fasteners holding it together.

Engines: 2 X General Electric J79-GE-17 turbojets, 11,870 lb.s.t dry, 17,900 lb.s.t. with afterburner.

Performance:
Maximum speed - 1430 mph at 36,000 feet (Mach 2.21), 914 mph at sea level (Mach 1.19). Cruising speed - 585 mph. Landing speed - 158 mph. Initial climb rate - 61,400 feet per minute. Service ceiling - 62,250 feet. Combat ceiling - 59,600 feet. Combat range - 595 miles. Normal range - 1,100 miles. Maximum range – 1,885 miles with maximum external fuel.

Weights:
Empty - 29,535 pounds. Gross - 40,562 pounds. Combat weight - 38,019 pounds. Maximum takeoff weight - 61,651 pounds.

Dimensions:
Wingspan - 38 feet 5 inches. Wing area - 530 square feet. Length - 63 feet 0 inches. Height - 16 feet 6 inches.

Fuel:
Maximum internal fuel in the fuselage tanks - 1364 US gallons (up to block 40) or 1225 US gallons (block 41 and beyond). An additional 630 gallons of fuel could be carried in internal tanks inside the wings. Maximum external fuel - 600 US gallons in a centerline tank carried underneath the fuselage. Plus 370 US gallons in each of two tanks carried underneath the outer wing pylons. Total fuel load – 3,334 US gallons (up to block 40) or 3,195 US gallons (block 41 and beyond).

Armament:
1 X 20-mm M61A1 cannon with 639 rounds. 4 X AIM-7 Sparrow semi-active radar homing air-to-air missiles in semi- recessed slots in the fuselage belly. 2 to 4 X AIM-9 Sidewinder infra-red homing air-to-air missiles carried under the wings on the inboard pylons. A total offensive load of up to 16,000 pounds could be carried on the centerline and four under-wing hard-points.