Proxy War Without End is the 41st story mission in Metal Gear Solid V: The Phantom Pain. You’ll have to take on a small army this time – tanks, armored vehicles, armored soldiers and a gunship. Do not use Quiet as a buddy on this mission. There is currently a bug in the game that can corrupt your save if you take her with you here. Go with D-Walker, instead.
Eliminate the CFA armored column assembling to the north of Nova Braga Airport. The column contains many large-scale fighting vehicles.
Eliminated the gunship
The gunship will appear shorty after you arrive. It will go to outpost #14 and hover there for a while. Do not shoot it yet – if you do, you’ll kill the commander as well. Instead, let it fly to Nova Braga airport, and engage it after the commander is safely on the ground. Using a rocket launcher with homing missiles is the way to go here. D-Walker can also do a decent amount of damage, if you equip him with missiles.
Eliminated 2 tanks
You can either extract or destroy them. If you want to blow them up, either use D-Walker’s weapons, or a grenade/missile launcher of your own. You can also use mines. One of them is going to the airport from the south, another from the north.
Eliminated 2 armored vehicles
Same as with the tanks – one is following the southern tank, while the other separates from the northern one at some point. They’ll be marked on your map, so you don’t have to worry.
Extracted 2 tanks and 2 armored vehicles
Extracting the vehicles is even easier than destroying them – all you need to do is run up to them, get their attention (so that they stop), then fulton them before they even have a chance to shoot. You could also use EMP mines or leave D-Horse in the middle of the road to stop them.
Extracted the armored column’s commander
After riding the gunship, the commander will be in one of the buildings in the western part of the airport. You’ll recognize him by the red berret.
Secured the rough diamond hidden by the armored column’s commander
The diamond is on a shelf in the room where the commander was hiding (west of the terminal building). It’s worth 100,000 GMP.
Secured the blueprint the gunship was carrying
After you shoot down the chopper, watch it closely to see where it lands. The game might bug out and not show the wreckage, but the suitcase with the blueprint will be where the helicopter crashes.