While Death Troopers will naturally want to stay close to Director Krennic in order to receive the armor boost, they are generally more powerful in close quarters. This is where large groups of enemies are, and the Thermal Imploder and Smart Rocket will kill more people per shot. For open areas, avoid using the Thermal Imploder, because it takes too long to detonate, giving the enemy time to escape. If both the Imploder and Smart Rocket are on cooldown, use the Cooling Cell when facing large groups of enemies to boost your firepower, as this will give you significantly more shots before you will have to cool your weapon. Don't leave Krennic while facing enemies, as you have very little health and can die incredibly fast.
Death Troopers pack a punch with their E-11D. Their armor also grants them additional health above normal infantry and they come into the battle with a Sonic Imploder that concusses nearby enemies while dealing damage. As such, Death Troopers are best used to disorient and overwhelm their opponents with effective use of their high fire rate blasters, using overload to increase this rate of fire to an even greater amount, high health, and Sonic Imploders that concusses enemies while dealing damage.