Rifleman
Low tech requirement
Easily massed
Weak overall individually
No specialties
Scout
Low tech requirement
Large sight radius
Mobile
No attack capabilities
Shock Trooper
Very mobile
High burst damage against infantry and structures
Short range
Slow re-fire rate
Fragile
Sniper
Incredible range and sight radius
One shot kill vs all infantry and high damage vs light armor
Slow movement speed
Very slow re-fire rate
Initial aim delay
Expensive
Long train time
Machine Gunner
High DPS
Above average range
Great endurance
Very slow movement speed
Initial aim delay
Expensive
Long train time
Grenadier
AOE special attack
Expensive
Designated Marksman
Good range
Good damage
Somewhat slow re-fire rate
Fragile
Informant
Various special abilities
No attack capabilities
Long train time
Fragile
Commando
One hit kill attack against infantry
Can cloak
Melee range (can't attack aerial units either)
Fragile
High tech requirement
Saboteur
Places remote detonated bombs
Defect related abilities
No normal attack
Expensive
High tech requirement
Corpsman
Can heal friendly infantry units
No attack capabilities
Engineer
Anti-armor capabilities
Can place mines
Can repair structures or armored units
No normal attack
Long train time
Roles
General Purpose Rifleman
Reconnaissance Informant, Scout
Assassination Sniper, Commando
Surgical Strike Shock Trooper
Defense Machine Gunner
Support Engineer, Corpsman
Sabotage Saboteur
Flanker Shock Trooper
AOE Grenadier
Glass Cannon Designated Marksman
Ambush Commando