I GOT IT TO WORK!!!
The problem is, that the M119 and the MLRS both spawn with no ammo. When you spawn the MLRS or the M119 make sure to add the proper magazine.
In the Initialization field of the M119 or the MLRS insert: this addMagazine "ARTY_12Rnd_227mmHE_M270";
to add HE rounds to the MLRS
this addMagazine "whatever ammo here";
Here is the list of ammo for the MLRS and M119 copy and paste the ammo inside the "Whatever ammo here"; (Leave quotations and semicolon)
So this means that the MLRS only fires HE rounds and the M119 fires everything. So if you want options in ordinance make sure you use the M119.
Also make sure that SecOp module is synced with the ARTY module, and make sure that the units are far enough away from the target.
Hope this fixes everyone's problem. :)