What back up to the Pueblo are you refering to? They were literally on their own. The nearest US air squadron was in Japan, and the ROK navy was uninformed about the ships activity. They were orphaned. Some of us on the ground in the ROK thought (at the time) it was a set up and war was eminent, of course Tet went off, and then it seemed just another coordinated diversion by the Commies. I know this, a divided front in Korea and 'nam would not have been practicle or even possible.