That is a beautiful area you're running through and it's amazing how the environment can inspire, isn't it? I live just outside of DC and sometimes I'll do my long runs like a running tour through the District. Instead of deciding how long or how far I want to go, I pick out which sites I want to visit. I've ran a lot of races down there so sometimes I'll do the Cherry Blossom Ten Mile race route, The Army Ten Miler route, or a portion of the Marine Corps Marathon route or something like that. With the Pentagon being there and the town filled with prior military, one always finds someone running somewhere so that's inspiring, too.
Like MikeDaMarine and another gentlemen said, it's definately a Marine thing when I picture myself running in formation and fall back into that frame of mind. My oldest son finished his gig in the Corps as well and after boot camp he confessed that he looked at me and figured if I could survive it, he could too. Little weasel. I told him I may be a fat old white guy now (I-Can't-See-My-Feet Dude) but back in the day I could have taken him. I DO know I'm running more now than back then, so sometimes I also imagine myself running with him. He does ok to about 5 mi. or so, but as we add miles he starts to fall out. Yeah, how do you like the old man now, laughing boy?
It's tough to accept the fact that I'll never have a really good pace (I'll-Get-There-When-I-Get-There Man) but I played baseball, football and hockey as a kid so I constantly have to remind myself that I'm not a natural distance runner, especially when I go to races and see people "warming up" at a pace faster than I can sprint. Pencil-necked Heathens. But the races are fun to do and it's a real sense of accomplishment when I finish (Where's-My-Bagel-And-Banana Boy).
BTW: If anyone wants a REAL kick in the pants and you haven't done so yet, get some friends together and do a relay. 12 people, 200 miles, 24 hrs. Now THAT will make you feel superhuman!