They are effectively small grenade launchers mounted to the front of vehicles loaded with smoke charges. They temporarily hide the vehicle behind a wall of smoke and is useful for providing cover, especially when the vehicle is out in the open.
- 1: GW Website Vindicator
- 2: Codex: Imperial Guard (3rd Edition, 1st Codex), pg. 9
- 3: Codex: Imperial Guard (3rd Edition, 2nd Codex), pg. 36