Find the file on prisoners in the camp
The intel data is in the cottage in the center of Kiziba Camp and the exact location has been shown in the above screenshot. You can collect the data at any point into the mission, even after the prisoners have either been rescued or shot. You can access the cottage through the entrance, or by crawling under it and entering through the hole in the floor.
Rescue three POWs
In theory, you can rescue the prisoners at any point into the mission, because they will be killed right after the Afrikaans interpreter is done interrogating them. Restart the mission, pick the Southern landing site and reach the location, where you spot the interpreter for the first time (to learn the details, see the previous page). Wait for the opponents to scatter and take interest in the POW that is being escorted towards the camp, by one of the guards. Eliminate the guard and fulton the prisoner.
The second POW to rescue should be the one in the shelter to the North of the main camp. He is the one that the interpreter is currently heading for, to interrogate him. If you do not want to take the risk, you can wait until the interrogation is over and get into action afterwards. However, this is going to make it more difficult to rescue the last POW.
You can find the last prisoner in Kiziba Camp. You need to approach its Southern part, because this is where prisoners are being kept. Keep all precautions here, because there are, at least, 2-3 guards around (either eliminate or distract them). Also, more can get here.
Note - If you want to rescue the last POW only after he is interrogated by the interpreter, you need to hurry to prevent him from being shot.
Extract materials containers
In total, you need to fulton four shipping containers with supplies, to complete this objective. Before you locate them, make sure that you have the CARGO 2 upgrade, and you have, at least, 40000 GMP spare.
Two of the containers are in the central part of Kiziba Camp (the one with prison cages and intel data).
Two more are near the Northern developments, i.e. right next to the building, where the Viscount would have been escorted.