Thought you might like to hear my ideas, I'll keep adding when I think of new ones, mostly US military gear because I know little of Chinese military gear.
Doctorate Specific HMMWVDesign:
CROWS remote turret, Basic & Supplementary armour package
Armament:
Browning .50 cal M2HB
Global Upgrade:
Up-Armoured - No armament armour.
Counter-mine armour kit
Central tire inflation system (CTIS)
Armament Upgrade:
Pedestal weapons mount - M240 GPMG
MK 19 40mm Grenade Machine Gun
TOW II Anti-Aircraft
106mm Recoilless Rifle/Milan Anti-Armour
Non-Doctorate Specific HMMWVDesign:
Manned open cupola turret, Basic armour package
Armament:
Browning .50 cal M2HB
Global Upgrade:
Up-Armoured -No CROWs system
Central tire inflation system (CTIS)
Armament Upgrade:
MK 19 40mm Grenade Machine Gun
TOW II Anti-Aircraft
106mm Recoilless Rifle/Milan Anti-Armour
Non-Doctorate Specific HMMWV, up-armoured

Notes: -
The CROWS system would have the advantage of the gunner not being killed so the gun can fire until the HMMWV is destroyed, it could also give a high armour or health rating as it has extra armour, due to no open-top. This could be disadvantaged by a slower reaction/turn speed of the armament.
The 'Counter-mine Armour Kit' could stop things like C4 (if the opposing forces have it) from sticking to the vehicle, so it comes as an invalid target or it bounces off, it could also be used to give extra health or armour rating as the underneath of the vehicle gains armour plating against mines.
USA Sniper - Doctorate SpecificDesign:
The unit would work start as a two man team, but as it gains a higher veterancy or a more powerful rifle, the spotter would be lost, as to counteract the sniper's over supremacy of infantry.
Armament:
M24 SWS - Unlimited, High reload rate, Medium rate of fire, Fast set-up, No vehicle damage, Short distance.
Global Upgrade:
Weapon Familiarity Training - Quicker Set-up, Better Accuracy.
Enemy Recognition Training - High rate of fire
Rifle Cleaning Discipline - More bullet penetration
Armament Upgrade:
M82/107 - Limit, High/medium reload rate, slow set-up, Medium vehicle damage, Long distance.
M95 - Limited, High reload rate, Slow Rate of fire, Medium set-up, Low vehicle damage, Long distance.
M40 - Unlimited, High reload rate, Low/Medium Rate of fire, Fast Set-up, No vehicle damage, Medium distance.
USA Designated Marksman Non-Doctorate SpecificDesign:
The Marksman would be a upgradeable member of a squad, (like the British in OF), and once had grants it's own squad upgrades, but may become an invalid upgrade if you go for the doctorate which grants snipers.
Armament:
DMR - Modified M14 Rifle - Unlimited, Low reload rate, Medium rate of fire, Fast set-up, No vehicle damage, Medium distance.
Global Upgrades:
Enemy Recognition Training - Higher rate of fire
Rifle Cleaning Discipline - More bullet penetration, Better accuracy
Armament Upgrades:
Mark 12 Mod 0/1 Special Purpose Rifle - Unlimited, High Rate of Fire, Medium Set-up, No vehicle damage, Medium distance.
SPR - Rail upgrades:
Vertical Grip - Better accuracy
AN/PEQ-2A Target Illumination - Better Target acquiring - Higher rate of fire, Better Accuracy