iChing spent some time at the base in Dyabakir (sp?) in eastern Turkey back in the 80s, and can fill you in, as he was Security at the time. Hope he see this.
Yes, at our site we had Turkish troops manning the main entry gate along with us. However inside the site we and only we controlled access to the inner restricted areas. Turkish troops manned fixed posts along the perimeter fenceline of the site while we made continuous vehicle patrols of the perimeter.
This same thing happened in Turkey in the late 70s just before I got there, I heard stories about the Turks essentially siezing our nukes so to speak, when martial law crackdown on terrorists was in place...I had to pass through Incirlik to get to/from my site when PCSing and traveling on leave...