Actually, the only version of the JSF that carries an internal cannon is the F-35A model. The B and C models have provisions for an external gun pod though.
This is reminicent of the of the situation with the F-4 Phantom, where the USAF (after experience with the gun-less C and D versions) bought the gun-armed F-4E, while the Navy & USMC made do with gun pods on the F-4J.
Not sure why the Navy and USMC were quicker to give up on internal cannon than the USAF though.
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