I’ve never been Navy, but from what I’ve been told, every job responsibility on a Navy vessel is associated with a single rate. In the Army Watercraft world, there are Deckies and there are Engineers. Engineers are responsible for everything mechanical on the vessel. That’s why we are trained on Electrical, Air Conditioning & Refrigeration, Welding, First Aid (with CPR & AED), Bilge & Ballast, Water Purification Systems, Waste Systems, Fuel Purification, Firefighting, Fast Rescue Boats, etc. in addition to the vessel’s basic operating machinery. On the LCU 2000 series, the crew is between 16-18 people. The Navy could never run our LCUs, as there isn’t enough berthing for the number of crew the Navy would require. Engineers do it all.