Since I spent quite a bit of my career with Military Sealift Command, and subsequently with many KP grads as well as other maritime school grads, I often found myself explaining their school to other Navy folks. I usually described USMMA as one of the five Federal academies, with a mission of producing maritime professionals for afloat and ashore work, with Navy Reserve commissions, and that their school had a dual mission that could uniquely send their grads to active duty careers in all the Armed Services, and the uniformed service NOAA. I would point out the Master of the USNS Ship Name, the fleet oiler which had just deftly unrepped their Navy destroyer (underway replenishment, refueling at sea), was also a Navy Reserve Captain and was due to go to the unit he commanded for his active duty time. Not all USMMA grads go on with their USNR career after the required time, but many do. They are master mariners, and fine officers.
MSC is not the merchant marine, and MSC employees are not really merchant mariners, they are DoD civilians mariners. I don't think anybody has gone to NOAA in years. Most MSC masters are not from USMMA and do not know much about USMMA, also the number of MSC masters who are O-6's in the Navy Reserve is a few at most.
Using experience with MSC to frame the Merchant Marine Academy is probably not the best idea. I spent months on a replenishment vessel working on those Un-reps, and the attitude towards the warships was, "Wow, those Navy guys are shmucks, they're working an Un-Rep at 2100 for zero overtime, we're all making double our hourly rate. Why would anybody join the navy?"