therefore, they fashioned a sub-course inside the Mahan course, as all other customers of that class were being Outfitted with Mark 21 pedestal mounts in all 5 positions. Bow of USS Mahan (DD-364) in June 1944. A further see from the Mark 21 open-again shield pedestal mounts. Be aware the groove within the deck of Mount #two. This was to allow a r