Just like everything else that goes with this game, we can always speculate, right?
Skills for Huxley
Medical
First Aid
First Response
Trauma Assist
Field Surgery
Surgeon
Repair
Small item repair
Small Arms Repair
Heavy Weapons Repair
Light wheeled vehicle repair
Heavy vehicle Repair
Small Arms
Ability to use certain types of weapons from Pistols to small caliber Machineguns (i.e.: .50 cal and below.)
Heavy Weapons
Ability to use certain types of heavy weapons from 20mm on up.
Sniper
Ability to use sniper weapons
Ability to use stealth
Light Vehicle Useage
Ability to operate Light vehicles
Heavy Transport Vehicles
Ability to drive these
Armored Assault Vehicles
Ability to operate tanks.
Combat Engineer
Ability to emplace mines and other CE obstacles, maybe set up trip wires.
Ability to detect and deactivate enemy mines and obstacles.
I'm sure I am omitting some. anyone else?