I hope that most people realize that all military installations on the continent of Usea that aren't controlled by the Erusians are controlled by ISAF. The countries on the continent of Usea are not completely united, but do share a common military (ISAF). This is why it is called the Independent States Allied Forces- the organization is the military force of the independent countries that make up Usea. This is why ISAF HQ at North Point has the flags of all of the allied Usean countries flying outside.
I noticed that some of the pages for military locations (like Allenfort AFB) on this site say that these bases are of unknown ownership. I figured this meant that the conclusion above was not reached by others in the community.
Most pages like those were created and/or edited by subpar editors back when Acepedia first started out in 2006. Back then, fan fiction was rampant and people who didn't know anything about Ace Combat were making tons of edits. That's why everything's changing now. :P
Pages like these with information like that are open to all kinds of constructive edits. That's what we're here for! So if you see something like that, feel free to fix it yourself as soon as you see it. :3