Chukles, or one of the recruiters will have a better answer than I can give you. My son fills an MST billett in NYC. His main duties are more Homeland Security related. Vessell boardings and inspections, portside container searches, pollution matters, fuel depot inspections...plus lots of ferry security. In the CG, you can wear a whole bunch of hats, and many ratings sometimes crossover to other duties. He's actually a BM, but doing an MST job. It happens. One thing for sure, he has nothing to do with weather forecasting!
Thanks for your service in the Marine Corps.