The Multiple Launch Rocket System (MLRS) is an armored, self-propelled, multiple rocket launcher used by different armies in the world.
The M270 vehicle can carry a pair of Rocket Packs Containers (RPCs) holding six 227mm rockets.
It's also possible for the launcher mount to also be capable of holding a rocket pod containing a greater number of smaller calibre rockets. Each pack could take 54 ea rockets 70mm (2.75”) in a 9x6 array.
Since the first M270s were delivered to the U.S. Army in 1983, the MLRS has been adopted by several NATO countries.