Quote Originally Posted by COMMAR View Post
The ATACMS is a reeaal beast. If you can put that thing on a truck I can't see why you can't fire it off an LCS?
Because every unguided ammunition would require a high degree of three-axis stabilization that's not existing for HIMARS and because HIMARS has no salt water hardening and MLRS/HIMARS' reloading procedure would not work properly on a ship at medium sea states.
The USN has done preliminary studies and came up with a prohibitively expensive approach for a navalized MLRS.

The German navy and industry recently installed a PzH2000 turret on a warship for testing purposes (keyword "MONARC") and was reminded of the enormous challenges of navalization. The idea was dropped.