Extract the container with materials
The container with materials is in the Eastern Communications Post, i.e. where you complete the main objective of the mission. You find it on the roadside. It is impossible to fulton the container when you are playing this mission for the first time. For this, you need the CARGO 2 upgrade that allows you to fulton containers and other heavy equipment. The earliest you can unlock that is after the tenth main mission, because one of the requirements is the transportation specialist on the crew, and you find him in that mission. After you obtain CARGO 2, replay this mission and fulton the container.
Rescue the hostages from Da Wialo Kallai village
There are two hostages from Da Wialo Kallai village that you need to rescue. You should take interest in that at the beginning of the mission, because it ends automatically after you sabotage the main base and step outside of the mission area.
After you reach the village, you can find the hostages on your own (marked in the above screenshot) or interrogate several guards, thanks to which you learn about the whereabouts of the prisoners. After you find a given prisoner, you need to pick him up, carry outside of the building and fulton him (send to the Mother Base using the balloon). Do not attempt that with the hostage still indoors!