Obviously, sticker shock will be an issue, but I'll give you my experience...
I spent a couple years applying to get out here from Tucson - ended up at APL three years ago, halfway between DC and Baltimore, and we live in Eldersburg/Sykesville, just up in Carroll County. With 4 kids, really wanted a 4-bed house, and are doing this on a single income (wife stays home with the kids), so this was a great solution, working out well. Originally, intended on waiting three years, then moving closer into DC, the Dulles-Langley corridor. It'll be three years at APL tomorrow, and I'm not going anywhere. Part of it is, they're a great employer, but the other part is, I like the living situation. Far enough out it's not so urban, work close enough in we deal with the defense programs closer in. Easy enough to spend a day in DC on the weekend, hit the museums with the kids, but save quite a bit on living expenses, day-to-day. I feel like we get the best of both worlds - small town day-to-day life, but reasonably close to DC/B-More when we want the big city perks. Happy to discuss more, if you want to shoot me a PM.