Back in the day I was part of a joint services installation team, installing Satellite systems to replace the undersea cables to the Pacific Rim.
One of our stops was Subic Bay in the Philippines. Of course at the end of the day we hit the local watering holes, and I can say this without any doubt. An Army guy can call a Marine a jarhead, or leatherneck, and a Navy guy a swabbie, or paint chipper, and get a smile and an offer to share a beer.
None of that happens between the swabbies and jar heads. Its a full out fight. Tables broken, bars destroyed, Shore Patrol involved. Nights in the brig. Craziest thing I've ever seen.
Ahem....
....could the little bit above in bold be because neither the Navy or the Marines want to mess with the Army?
Just for perspective, most of my uncles fought in the Navy in WWII in the Pacific theater. When 1966 came around and I enlisted in the Army, I caught all kinds of h*ll from them about going Army. I simply stated that I'd rather sit out in the rain and let it run off of me than sit out in the water, dog-paddling, wondering where the h*ll the rescue craft were or how far away land was. (I can swim, but I don't like swimming all that much. I can walk or crawl if needed.)
Oddly enough, while the uncles grew silent for a while, they still came back to rib me.