I had to look that up. RS-80 one of this doomed multinational projects where the parnters couldn't agree. Never saw MLRS in action but what I heard it is rather impressive.Ahhh, so it was the project name.
LARS was the 110mm weapon system that predates MARS, mid to late 60's if memory is correct. MARS was originally a competition between the British FOIL (Would you like to know more?) system and the RS-80. The Germans had been playing silly buggers to avoid under all circumstances, buying the superior British system. Then the Treasury got fed up and cancelled FOIL, leaving the Germans looking all smug and thinking how the British would now have to accept their system.
Then the US whom had been saying "Nope we're not interested" suddenly showed up and said "Look what we've got! It's the new NATO standard, so pay up!", and the Germans were hoisted by their own petard as they had delayed for so long the US had managed to catch up.
To be utterly fair the MLRS was a good system with advantages over both the RS-80 and FOIL. But one does have to wonder how the FOIL would have turned out.