A Marine only knows how to get the lube where it is needed one way and applies that training unilaterally. Since a Marine only knows how to fuck and kill, it is uncertain where the technique demonstrated originates, but the smart money is on a Marine learning the technique servicing a weapon first because Uncle Sam made him a man first.
In the army we called that lube the whale sperm. I'm not even joking. It is called LSA, and the cold weather one is LSA-T. But when you have a bunch of young 20's infantry guys we just called it the whale sperm.