Like armies of the 20th century, the Mobile Infantry troopers use MK-55 Rocket Launchers to destroy large targets. The primary munition of the Launchers is the Tactical Oxygen Nuke; a small Nuclear explosive the size of a grenade which is fired at targets over a range of several hundred yards. They are capable of vaporizing everything in the blast radius.
These portable rocket launchers were issued to the Sixth Division of Mobile Infantry for the campaign against Klendathu and the other planets in it's starsystem. The launchers were often used to launch Tactical Oxygen Nukes at Plasma Bugs and down into Bug holes that led to underground layers.