I think Proceedings is fine. I've been getting the magazine since I was commissioned some years ago, and have always thought it worth getting. Back in the day it was devoted entirely to naval issues (including the Marines and USCG), but now it is branded as "The Independent Forum on National Defense."
Still, they focus much on Naval-related issues. They have some gems on small wars/COIN/etc, but also has lots of articles on RMA-related things that, if you ask me, are just large advertisements for defense industry firms and weapons systems projects.
Lots of USN and USMC authors, and to a lesser extent, officers from the other services.
I don't really think there's an equivalent for it, now that it's moved from its naval roots to a more national-defense related journal.
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