Hellstorm missile launcher

The M220 Launcher 2, but more simply called the Brotherhood launcher, is a weapon in the Fallout 76 update Steel Dawn.

Characteristics
A multi-purpose rocket launcher, the Brotherhood launcher was one of many weapons recovered from a government facility encountered on the Brotherhood First Expeditionary Force's way to Appalachia. Able to fire four to six rockets of various payload types, the Brotherhood launcher functions in a similar manner to its missile launcher cousin.

Behind the scenes
The Brotherhood launcher is officially the M220 Launcher 2, an in-universe upgrade to the M202 FLASH (FLame Assault SHoulder) rocket launcher.