Extract three Walker Gears
The aim of this objective is to extract, to the Mother Base, three Walker Gears, used for patrolling Afghanistan Central Base Camp. Get to a good viewpoint to locate Walker Gears (they should be patrolling either the central or the Western part of the camp) and approach one from behind. It is best to put the operator to sleep (you simply need to use the pistol with the right type of ammo), but you can just as well shoot him. Regardless of what you do, do not let such an opponent spot you (Walker Gears use the powerful gatling guns). The same goes for the rest of the enemies in the base.
After you eliminate the operator of a given Walker Gear, you can approach it and fulton it to Mother Base. However, remember about two restrictions here. First of all, you need to have the CARGO 2 upgrade, for the fultoning device (thanks to which you can send heavy equipment back to your base). Secondly, fultoning a single machine is 10000 GMP, so you need, at least 30000 GMP available. Repeat the above steps for the rest of the walkers.
Find the poster at the HQ
You can try to obtain the poster during your exploration of Afghanistan Central Base Camp, while trying to locate Dr. Emmerich. The Poster is on one of the walls of the building to the South-East of the hangar with Emmerich inside. The spot has been marked in the above screenshot.
Find blueprints in the HQ
The blueprint (BAMBETOV SV) is inside one of the hangars in the center of Afghanistan Central Base Camp - the location has been marked in the above screenshot. You should try to obtain this item the first time you are in the base, because the hangar door will be locked if the alarm is raised (the lighting above the door will turn red from blue). After you enter the hangar, examine the metal shelves. The blueprint is on one of them.