|Actual Royal Marines.|
What strikes me as odd is that I also looked the phrase up and the meaning is negative. And it doesn't refer to our Marines, as you might assume, but to Brits -- the Royal Marines. This used to be something said about naive, rookie Marines -- who would apparently believe anything they heard. The full phrase at the time was "You may tell that to the marines, but the sailors will not believe it".
So how could this be a company slogan? It's derisive in nature. Help me solve this mystery. Does anyone remember the jingle? (I'm afraid anyone under 50 is out of the running on this one; sorry. It's from way back, I think.)