The kill guards at cellblockb seems glitched, the gate is blocked, cant enter and the rescued people cant exit, tanks that are supposed to join you periodically pile up behind the gate.
I had to kill guards with nuke.
I noticed this in the coop version a while back, but assumed it was just a bug with the conversion. Is this in the proper campaign as well?
Go to Bug Report amigo.
This is becoming a common problem.