[Imp]

Its a suppresion thing.
So unit in questionan US Rangers are elite & a big squad so have a higher chance of success (more men to distract). If they fail will be suppressed & thats assulting over.
If they pass doing any sort of damage they are as they would be pretty pleased with themselves & more than willing to have another go. If they now have another go at a previosly targeted (unsure) suppressed or damaged vehicle there success rate has gone through the roof or more likely his.
Suppresion only jumps if they fail.

If however you are saying you moved a vehicle 1 hex & it is attacked 2 times thats 2 squads you failed to see.
Op Fire is one round of shots per unit for an action, move or fire so 2 units reacted.

Does that make sense?