Follow the waypoint marker to meet up with the Sergeant. Run away from your current area after the explosives have been set and head for the cover. Head to the fairgrounds to check the army outpost and witness firsthand that it is now overrun with zeds. Simply fight your way through the zombies and head to the marker to clear this mission.
After clearing this mission, look out for the survey point which can reached by climbing up the Ferris Wheel nearby through the ladder. Finally, the fairgrounds will be a Potential Home Base. It is one of the largest Potential Home Bases in the game.
I failed the mission and it's glitches now!