In the "Escort ULP" setup mission for Act 3 of the Doomsday Heist you'll utilize the previously acquired Chernobog to defend Agent ULP's helicopter from enemy attack choppers.
For this mission, you do not necessarily need to have a lot of snacks and armor but it would be good to have just in case, since you will be driving in the middle of a lot of enemies. One thing that is absolutely essential however is the Armored Kumara. You need to have an Armored Kumara for this mission to safely execute the first half of it.
First, you will need to go to the Paleto Bay Construction Yard and kill the security team. Since you will be inside your Armored Kumara, they won't be able to shoot at you. Stay inside the car and take out the whole security team.
After that hop into the Chernobog and drive to the landing site as instructed by the game. Once you reach the landing site, you will notice that ULP is being chased by some attack choppers. You need to go into stationary mode while inside the Chernobog and take out the enemy choppers chasing ULP.
If your friend is driving the Chernobog then you will be the missile controller and if you are driving then your friend. So, make sure you guys communicate well to stop the vehicle and drive it on time.
