Technically, yes it is. BUT if u ever talk to a Marine, or any thing to do w/ the Marines, you don't normally say "Corps" you usually just say "Core". And before you ask how I would know this or if I'm sure, Yes I am sure because I am enlisted in the Marines, and do plently of talkin to them. I'm not tryin to get an attitude or anything either, if that's what it sounds like.