B-25J 'Mitchell' from the Confederate Air Force. Photo by Bob Nelson.

The final version of the Mitchell, the B-25J, reverted to the longer glazed bombardier's nose, but with a relocated-forward dorsal manned turret. All but 800, J-models featured the earlier "greenhouse" style nose containing the bombardier's position. .50 cal. (12.7 mm) machine guns ring the bomber including the nose, fuselage blister guns, top turret, waist gunners, and tail guns. -wiki