Chris, I may be wrong but I believe that's a 5.56mm SAW, not a .50 cal. Look at the size of the magazine, not long enough for a .50.
For those who have never been to San Diego, here are a couple of other shots to help with the perspective of size and location.
First is a shot of the harbor, without any zoom used. The boomer is at the far left, right behind the wake of a jet ski. The guy on the jet ski was either a SEAL or completely insane.
Next is a closer look at the same scene. Those little spots on the deck of the sub are people.
Last one, a better shot of the two boats passing.
Compare the the picture that Chris took, from a much closer distance, of the men on the boat's sail, to my picture taken from about a mile away. They don't call them "Boomers" for no good reason. The Ohio class missile platforms are a real Doomsday machine. (I'm just glad that they're OUR doomsday machine.) [img]<<GRAEMLIN_URL>>/flag.gif[/img]