B-25J MITCHELL "FOREIGN AIR FORCE" / "ML/KNIL"
The final, and the most built, version of the Mitchell, the B-25J, looked much like the earlier B, C and D, having reverted to the longer, glazed bombardier's nose, but with the -H version's relocated-forward dorsal manned turret. The less-than-successful 75 mm (2.95 in) cannon was deleted. Instead, 800 of this version were built with a solid nose containing eight .50 (12.7 mm) machine guns, while other J-models featured the earlier "greenhouse" style nose containing the bombardier's position. Regardless of the nose style used, all J-models also included four .50 in (12.7 mm) light-barrel Browning AN/M2 guns in a pair of "fuselage package", flank-mount conformal gun pods each containing two Browning M2s, located directly beneath the pilot's and co-pilot's compartment along the external sides of the cockpit, with the co-pilot's seat and dual flight controls restored to their previous cockpit locations. The solid-nose B-25J variant carried an impressive total of 18 .50 in (12.7 mm) light-barrel AN/M2 Browning M2 machine guns: eight in the nose, four in the flank-mount conformal gun pod packages, two in the dorsal turret, one each in the pair of waist positions, and a pair in the tail - with fourteen of the guns either aimed directly forward, or aimable to fire directly forward for strafing missions. No other main series production bomber of World War II carried as many guns. The first 555 B-25Js (the B-25J-1-NC production block) were delivered without the fuselage package guns, because it was discovered that muzzle blast from these guns was causing severe stress in the fuselage; this problem was cured with heavier fuselage skin patches. Although later production runs returned these fuselage package guns to the aircraft, they were often removed as a field modification for the same reason. Later B-25J was additionally armed with eight 5 in. (130mm) high velocity aircraft rockets (HVAR). In all, 4,318 B-25Js were built.

The U.S. supplied 862 B-25(of B,D,G and J types) aircraft to the Soviet Union under Lend-Lease during the Second World War via the Alaska-Siberia ALSIB ferry route.

Other damaged aircraft arrived or crashed in the Far East of Russia, and one Doolittle Raid aircraft landed there short of fuel after attacking Japan. It is not known what happened to these latter aircraft. In general, the B-25 was operated as a ground support and tactical daylight bomber (as similar Douglas A-20 Havocs were used). It saw action in fights from Stalingrad (with B/D models) to the German surrender during May 1945 with (G/J types).

At least 21 Mitchell IIIs were issued by the Royal Air Force to No 342 Squadron, which was made up primarily of Free French aircrews.

Following the liberation of France, this squadron was transferred to the newly formed French air force (Armée de l'Air) as GB I/20 Lorraine. These aircraft were operated by GB I/20 after the war, some being converted from bomber configuration into fast VIP transports. They were finally struck off charge in June 1947.

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