The War Machine missions require that you destroy the four War Machines, marked by an "L" on the map. There are two missions for each War Machine; one for killing the Overseer for the map to the machine, and another for destroying the machine. Get 100% Synch by performing the corresponding tasks in the following missions:
MISSION - TASK "War Plans for Outgunned" mission - Send the Mercenaries into a fight. "Outgunned" mission - Do not kill anybody before destroying the blueprints. Reward is Machine Gun model. "War Plans for Loose Cannon" mission - Use the kick attack against the Overseer. "Loose Cannon" mission - Open 1 of the first 3 gates, Reward is Naval Cannon model. "War Plans for Flying Machine 2.0" mission - Use a smoke bomb to stun the Overseer. "Flying Machine 2.0" mission - Do not get shot while using the Bomber. Reward is Bomber model. "War Plans for Hell On Wheels" mission - Use the pistol to kill the Overseer. "Hell On Wheels" mission - Do not take damage while using the tank. Reward is Tank model.