The Heavy Trooper has three main attacks. Firstly, he is able to attack with his Particle Cannon, which works the same way as the player's. Heavy Troopers will only fire their particle cannon in bursts with a short pause between; there is a distinctive mechanical wail as the Particle Cannon spins up before firing to warn the player. His second attack is only used at very long range, and consists of the Trooper firing a shotgun-like burst of 5-6 slow-moving energy balls which travel in a straight line. At very close range he can discharge energy to create a shockwave, which will both deal damage and knock the player out of the Veil if they were in it at the time.Heavy Troopers use very simple tactics, usually just ignoring anything the player does and advancing toward their position; they will not try to take cover and cannot dodge grenades thrown at them. However, their armour is impervious to standard attacks. Looking at them through the veil reveals two glowing red weak spots, the shoulder vents; these can be attacked with any weapon and have only 20 health points. When both are destroyed, a third (seemingly an emergency valve) will extend from the top of Heavy Trooper's backpack with 1 health point; destroying this final weak spot will cause the Trooper's backpack to overload and blow up, destroying him in a small explosion. 

Mire is effective for taking out the vents and one of the best weapons to use is the Kar98 due to its high damage and precision; with a good aim, the Kar98 is able to kill a Heavy Trooper in as few as three shots. Shield will protect from the Particle Cannon beam, but does not redirect it even if the player has the Reflecting Crystal upgrade. See: Wolfenstein (2009)