Engineer (Long War)

The Engineer is a unique class that has no equivalent in vanilla XCOM, though they borrow some elements from the Grenadier Heavy and Support classes. Engineers are specialized in the use of grenades, with their starting Grenadier ability giving them two uses of each damaging grenade item they carry, and a bonus to grenade throwing range, and have several more perks to improve grenades further. Engineers also have access to perks improving their ability to destroy cover, and improving their use of the arc thrower.

Primary Weapons: Assault Rifles, Carbines, SMGs, Battle Rifles, Shotguns

Secondary Weapons: Sidearm

Abilities

Rank	Ability
Specialist	Grenadier Allows two uses of damaging grenade items, and increases grenade throw range by 20%.
	Confers -1 Mobility
Lance Corporal	Sapper +1 damage with AP and HE grenades, +2 damage with Alien grenades and triple environmental damage for all weapons.	Smoke Grenade Carry a smoke grenade. Deploying a smoke grenade as your first action no longer end your turn.	Rapid Reaction Confers a second reaction shot, if on Overwatch and the first reaction shot is a hit.
	No other bonuses.	Confers +1 Aim	Confers +2 Aim
Corporal	Holo-Targeting Shooting, flushing or suppressing enemies also confers a +10 Aim to any allies' attacks on those enemies.	Dense Smoke Smoke Grenades have increased area of effect and further increase units' Defense by 20.	Sharpshooter Bonus +10 Aim against enemies in full cover, crit chance +10% against all targets.
	No other bonuses.	No other bonuses.	Confers +2 Aim
Sergeant	Repair Confers +2 charges for Arc Throwers.	Smoke and Mirrors Carry two Smoke Grenades, Flashbangs, Chem Grenades, Ghost Grenades or Battlescanners in one item slot, also increases charges from Smoke Grenade and Battlescanner perks by 1.	Ranger +1 damage with your primary weapon and rocket launchers.
	Confers +1 Mobility	Confers +1 Mobility	Confers +1 Aim +1 Will +1 Mobility
Tech Sergeant	HEAT Warheads Rockets and Grenades do 50% extra damage to robotic enemies.	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.	Battle Scanner Grant 2 Scanning devices. When thrown creates a new source of vision for 2 turns.
	No other bonuses.	Confers +1 Will	Confers +1 Aim
Gunnery Sergeant	Packmaster All limited-use items in your inventory receive one extra use.	Ready For Anything If the unit fires without moving, it automatically enters overwatch.	Will to Survive Reduces all normal damage taken by 1.5 if in cover and not flanked.
	No other bonuses.	Confers +2 Aim	Confers +2 Will
Master Sergeant	Bombardier Thrown item (grenades, battlescanners) range +50%	Fire Rocket Fire a rocket using an equipped launcher.	Extra Conditioning Confers bonus health based on which type of armor is equipped. Heavier armor increases the bonus.
	No other bonuses.	Confers +2 Aim	Confers +3 Aim +3 Will +1 Mobility

Stat Progression

Rank	HP at level	Total HP	Aim at level	Total Aim
Specialist	1	1	2	2
Lance Corporal	0	1	2	4
Corporal	1	2	2	6
Sergeant	0	2	2	8
Tech Sergeant	1	3	2	10
Gunnery Sergeant	0	3	2	12
Master Sergeant	1	4	2	14

Tactical Advice

Role: Offensive Support / Defensive Support

Engineers are a class largely based around items and special abilities. Their starting Grenadier perk allows them doubled offensive grenades and a throw range bonus, and they can boost their offensive grenades further with Sapper and Bombardier. With perks such as Smoke Grenade, Dense Smoke and Smoke and Mirrors, Engineers can also become extremely proficient with defensive grenades, such as smoke grenades, ghost grenades and flashbangs, since the range bonus from Grenadier and Bombardier applies (Bombardier even works with Battlescanners, which are also available as a perk). Engineers can also enjoy triple uses of the Arc Thrower with the Repair perk. Unfortunately, all of these roles compete for your two item slots.

On the downside, Engineers have the worst aim progression of all classes, so should you manage to exhaust your special abilities Engineers are lacking in offensive ability. Their dependence on items means Engineers are hard pressed to spare an item slot for a defensive item such as Chitin Plating, which, since they need to be near the front to throw their grenades at enemies, can leave them a little lacking in defense.