Outlying Field, Mount Vernon, Washington. Today, it serves as Skagit Regional Airport, but when it was constructed during WWII, it was an auxiliary field for NAS Whidbey Island just a short hop away. It continued intermittently as a naval training field but was declared surplus in the late 1950s.
No one had the correct guess, but a couple of frequent visitors to this website knew the name because I had previously shown them the photo. Gentlemen that they are, they kept their knowledge to themselves, refraining from trying to be the most brilliant guy in the room.
Next time you are in the area, stop by and visit the Heritage Flight Museum located at the airport.