The Infantry class borrows elements from vanilla XCOM's Assault and Heavy classes. Their signature ability is Light 'Em Up, which behaves identically to the vanilla Heavy's Bullet Swarm perk.
Primary Weapon: Assault Rifles, Shotguns
Secondary Weapon: Pistols
Abilities
Rank
Ability
Specialist
Light 'Em Up Firing with the first action no longer ends turn.
No other bonuses.[Verify?]
Lance Corporal
Covering Fire Overwatch reaction can trigger on enemy attack; does not work with suppression
Executioner Aim and crit chance against low health targets +10
Steadfast Immune to panic, except Psi Panic.
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Corporal
Opportunist Reaction shots no longer suffer aim penalty and are allowed to crit
Gunslinger Confers 2 bonus damage with pistols.
Ranger +1 damage with primary weapon.
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Sergeant
Suppression Can fire a special shot that grants reaction fire at a single target. The target also suffers a -30 Aim penalty and reduces the range of all AOE attacks.
Aggression '
Tactical Sense Confers +5 Defense per enemy in sight (max +20).
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Tech Sergeant
Lock N' Load '
Will to Survive Reduces all normal damage taken by 1.5 if in cover and not flanked.
Sharpshooter Bonus +10 Aim against enemies in full cover, crit chance +10% against all targets.
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Gunnery Sergeant
Sentinel '
Extra Conditioning Confers bonus health based on which type of armor is equipped. Heavier armor increases the bonus.
Bring 'Em On Adds 1 damage on critical hits for each enemy the squad can see (up to 5).
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Master Sergeant
Rapid Fire Take two shots against a single target in quick succession. Each shot carries a -15 penalty to Aim.
Resillience Confers immunity to critical hits.
Vital Point Targeting Confers 2 bonus damage against targets that have been autopsied.
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Stat Progression
Rank
HP at level
Total HP
Aim at level
Total Aim
Specialist
1
1
5
5
Lance Corporal
0
1
3
8
Corporal
0
1
3
11
Sergeant
1
2
3
14
Tech Sergeant
0
2
3
17
Gunnery Sergeant
0
2
3
20
Master Sergeant
1
3
5
25
Tactical Advice
Infantry are mid-range damage dealers. They can fire twice per turn if they don't move, which makes them excel at eliminating enemies by attrition. Because they must remain stationary to fire twice, they tend to perform best with assault rifles rather than shotguns, which are more position dependent - if you want a more mobile soldier who's designed for mobility and getting flanks, look to the Assault class. Infantrymen's ability to fire twice per turn makes them competitive with Snipers at direct damage.
Infantry have decent aim progression and at least one talent at each rank that improves their proficiency with their primary weapon. They also have a selection of defensive abilities available at each rank. Finally, Infantrymen have a powerful perk combination to improve overwatch in Covering Fire, Opportunist and Sentinel.