The biggest and baddest actors usually aren't. The most capable and most dangerous people are always the most polite and amiable folks around, they have nothing to prove but the guy who goes out of his way to look scary is usually trying to cover up something and putting on a bluff.

Talk to a US Army Ranger and you'll find a very nice person who knows what it's all about and doesn't put on some big show. And ah, you Marines out there...The US Army Ranger school trains your Force Recon Marines, so get over it...LOL!