For simplicity I just put an MLRS named art1 a civilian car named car1 and 2 switches. Switch 1 Radio Alpha - art1 doTarget car1. Switch 2 - art1 fire "MLRS". It worked perfectly. Replace "MLRS" with "GRAD" for the russian mobile artillery. I am sure you will want to put this into a script and all, and prolly want to have the arty angle set to something so it is pointing up, but that is another problem. If I work all this out myself I will post the script here.