a quick reply on DC- Dupont didn't get gay bars until much later than Georgetown and Capitol Hill although Annie's Steak House has been here forever. I was often at the Plus One across from Barracks Row, the first major gay dance bar in DC in the early '70's, where Jerry Smith, the Redskins' tightest end, also hung out. In high school I would sneak into Mr. Henry's Georgetown daily (drinking age was 18 and it was a cafe) in the late '60's. Louis leather bar was on 9th NW at Penn and Naples was a gay hustler bar/hotel next to the Trailways bus station where many Marines waiting for the Camp LeJeune bus would come for extra cash/and or booze. It was glorious. My #1 of 3 years now is a US Marine. https://dc-policy-center.github.io/iframe-content/timeline-of-lgbt-places-spaces-dc/rainbowHistoryFull.html
On the topic of SoCal Marines:
You do realize that Oceanside is mostly Marines and has 3 gay bars. Bi (and Buy) Marines wander in and around them often. The transit terminal (bus station) is full of younger low-level Marines without cars. While there are occasional pick-up targets in San Diego for Marines (and Navy) they rarely show up on Washington in bars or the gay strip club. Maybe I've just had bad timing there. Ditto Black's Beach and southern San Clemente. But Oceanside has always been fruitful, even with a lover in tow. One of the best looking guys I've ever seen was a Marine we picked up at the WalMart for a 3 some. A gay man looking for trade is like a kid in a candy store in Oceanside. I'd rate the WalMart best. http://www.cruisinggays.com/oceanside/c/areas/