The rocket launcher is the largest weapon in the game, taking up 3x8 (24) blocks of inventory space and having a substantial draw time. Ammunition is fairly rare, but the rocket launcher is devastating, able to take down even mechs and bosses in short order. For loading, the rocket is inserted into the rocket launcher by a breech in the middle of the tube. The sight is a flat and foldable screen.
The weapon can be fitted with a unique mod allowing the rockets to lock on to targets.
In the underground section of FEMA facility with the patrolling bot inside Highland Park, along with some rockets. It will be lying in the area to the left from where you enter, past the wall of pipes blocking access.
The Rocket Launcher takes up 3 x 8 (24) slots in the inventory.
During the cinematic where Adam Jensen and Faridah Malik are ambushed by Belltower Associates, a Belltower soldier uses the rocket launcher to take down the VTOL. Interestingly, the rocket didn't strike the VTOL, it generated a pulse of EMP that took it down. This is the only time it is shown, as the rocket launcher cannot fire EMP rockets.
It appears to be based on the SMAW (Shoulder-Launched Multipurpose Assault Weapon) rocket launcher.
The muzzle of the tube is the same as the MBT LAW missile launcher.
Early descriptions imply the weapon was to have been able to use both anti-tank HEAT and general use high-explosive dual-purpose (HEDP) rounds. Only the latter are actually available in the final game.