GMP farming 120k per 42 second cycle (including loading time)

1. start the Side-op "Eliminate the Armored vehicle Unit 06" in Angola
   D-Walker with fulton launcher needed
   wormhole extractor makes it easier but fulton is also ok (it modifies the D-Walkers fulton launcher accordingly)

it is possible to set up the cycle without further weaporry, just pick anything that suits your fancy because the money spent will be gotten back easily anyway without any ammo loss once inside the cycle.

get D-Walker into the position on the screenshots:
after loading the checkpoint the soldier patrol starts at the beginning of the red arrow.
The heli never saw me even when driving D-Walker and flew past me.
The foot patrol may notice you but reloading checkpoint takes not much time so you can experiment and get a feel for it,

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[formatting help needed: how to force line break after pic?]
after some tinkering I found the above position (3rd pic) even better, because the first one was too close to the checkpoint so I had to move away to trigger it:

from this position:
- you can hit the top of the 50k vehicle with a bit of precise aiming
- the 70k vehicle is in plain view and in range as well
- the foot patrol does not see you on D-Walker (at least night time. haven't tried daytime enough to be certain)

SETUP
pick the landing site south of Outpost 20 and east of Munoko ya Nioka Station

to get into that position the easiest way is to shoot down the heli on the airdrop approach with your helicopter's minigun and to get rid of any interloping soldiers and snipers by sneaking or sniping them. vehicles are easily dispatched with D-Walker's fulton launcher.

to be able to repeat the cycle you must not eliminate the whole target unit (all soldiers and vehicles)

The setup may take max 10 minutes because I was messing around but it should be doable in less than 5 depending on what equipment you take.

the map in the first pic shows myself at the checkpoint, D-Walker next to it, ready to be mounted and to fire the fulton launcher.

cycle steps after setup and checkpoint reload:

1. go to D-walker, mount
2. fire the fulton launcher at both vehicles
3. dismount
4. move back to checkpoint
5. as soon as checkpoint saves reload checkpint
   These steps take me ca. 42 seconds.

additional boni:
if you need soldiers you can easily identify the best ones in the foot patrol and pick them off with D-Walker's fulton launcher (wormhole only because normal fulton gets shot down by the soldiers)

This technique can probably be set up with many other armored vehicle and tank elimination missions. This one happened to be available to me with a checkpoint so close to the action.

armored vehicle 04 in Angola worked ok but required more running from the checkpoint to the optimal D-Walker position.

video of two cycles one after the other: (link in case embedding fails: https://www.youtube.com/watch?v=9dRwvdSaZiU )

the second cycle in the video above shows that I dismounted too close to the checkpoint and had to move further away to trigger it.

Here is a longer video as Proof of concept including failed attempts. chapter timestamps in the Description allow to skip to the parts you are interested in:
https://www.youtube.com/watch?v=0hNhUlB8OPg
(age restriction just because of in-game violence to play it safe with censorship/guidelines)

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This section is for adding more details later in case feedback in the comments makes it necessary.

I got inspired by this video:

https://www.youtube.com/watch?v=ZxWILlt6Z0g
most important info from there is that D-Walker ammo gts reset to max when loading a checkpoint.

Hope you enjoy playing around with this farming technique.