Hydra
From Halopedia, the Halo wiki
The Hydra MLRS is a series of infantry support weapons employed by the UNSC and manufactured by Chalybs Defense Solutions.
MLRS-1 Hydra
The MLRS-1 Hydra was employed by UNSC forces during the early stages of the Created conflict.[1]
MLRS-2 Hydra
The MLRS-2 Hydra is employed by UNSC forces operating on Installation 07.[2]