Several PCs need hacking to recover repair logs. Fisher can also rig warheads in east and west missile bays to explode as a contingency.

Head past the bunker entrance and look for a small clerical area with a shuttered corner office. The DPRK officer inside has his butt occupying the PC Fisher needs. You know what to do.

The PC inside the control room above the missile loading bay. This room is past barracks and storeroom; country music may be heard in that room.

The PC in the missile tracking room where the base commander executes a technician for gross negligence. It's one of the PCs in the upper level.

The PC inside west missile bay control room, right next to the one where the missile abort codes are entered.
There are two warheads in the east and west missile bays that can have their wires bypassed. Rig them both and complete this objective.