Commando

The Commando, also known as a Heavy Weapon Dude, is a recurring enemy that appears in almost every Doom installment. They are generally the final and most powerful enemy of the former human class.

Doom RPG
In Doom RPG, the Heavy Weapon Dude appears as the "Commando" monster class. There are three variations, identified by color: Their attacks are capable of destroying jammed doors, much like the axe does, and will attack three times consecutively. They are weakest against plasma attacks.
 * Troop (yellow)
 * Commando (blue)
 * Assassin (normal colors)

Doom 3

 * Main article: Commando (Doom 3)

Doom Eternal

 * Main article: Riot Soldier