Rocket troopers are available as an option for Arcturus Mengsk in Co-op Missions. They are upgraded from Dominion troopers for 160 minerals, which give them the ability to deal heavy damage to air targets from range. When a rocket trooper dies, their gear will fall on the map, and another Dominion trooper can pick them up and upgrade themselves. The weapon will also drop if the unit swaps itself to a Dominion laborer.
When Amplified Airwaves is researched, Imperial Support is increased from 1 to 2. Mastery: +0.01 (+0.02 with Amplified Airwaves) Imperial Support per Laborers and Troopers Imperial Support mastery point. Up to a maximum 1.3 (2.6 with Amplified Airwaves) Imperial Support.
Dominion trooper and laborer select, move and attack quotations change depending on the level of Imperial Mandate the player has. At 34 and below, they are more reluctant, at 34-67, they are more "regular," and at 67 and above, the quotes are patriotic and assured.