I think there should be a healthy respect between the marines and TSN crews, with the term “navy boys” being more of a term of endearment rather than disdain. They have to still work in close proximity to one-another. I think too that marines should operate like they did on old naval warships (think tall ship era). A marine detachment would be aboard the ship and would have its own leading officer and chain of command, separate from the navy personnel. However, they would still answer to the captain of the ship and conduct their actions based on the need of the ship. They are the experts in combat when it comes to firefights, boarding actions etc. They’d be loyal to the captain of the ship, and stick rigidly to tradition and discipline.