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I learned one reason why the F-35 is such a money pit. The three versions of the plane share about 25% of their parts. Everything else is unique to each version. I still think it would have been faster, cheaper and better to build one version for the navy and have the arresting gear on a modular package that could be added or removed as needed. Actually, during the War, the F4U Corsair was used by both the Navy & Marines. The Marines would often just remove the tail hooks.