There's a metro rail and there are ride-on buses that I used fairly often while living in Bethesda. Just something to keep in mind that you might find it nice to live near a metro stop. My brother lives in Highland House in Bethesda on Wisconsin Ave. It's expensive, but it's close-ish to National Naval.
Georgetown is exciting, but there are obviously a lot of college kids there --- When I used to drive to Georgetown U Hospital from Bethesda, it would take me 30 minutes to drive there, but over 45 minutes to get home. That was fifteen years ago. Friendship Heights might be convenient for you. I'd rather walk on hot coals than live in DC, personally. . . I'm trying to remember if you can be in Friendship Hgts and still be in Maryland. . .good luck to you. I daresay someone who is more current will be along shortly to give you more and better ideas.
PS Of course --- the good thing about twelves is you'll be traveling at non-peak hours, if there is such a thing in the DC metro area anymore.