Desired Roles that will make your life easier::
Botanist
Zoologist
Biologist
Medic
Explosives Specialist
Survivalist
Hunter
Gatherer
Scavenger
Close Range Weapons Specialist
Long Range Weapons Specialist
Electronics Specialist
Linguist (Russian)
Linguist (Chinese)

Just to make your life harder, we won't have enough players to cover all important roles.

I will probably think of more.