Vehicle Specifics
Vehicle combat follows the same simple model as all combat in the Galactic Flashpoint universe. You choose a target, you choose which of your weapons to fire at the target, and you total the damage dealt to the target. Like every other unit, it may only fire its weapons once in any 12 hour period (generally in a single combat post). There are only a few specific rules that apply to vehicles beyond this simple core mechanic.
Multiple Targets
Vehicles may only make one attack versus one target in a 12 hour period.
Attacking Capital Ships, Support Craft, Platforms
Vehicles can only engage with Capital Ships and Support Craft that are themselves actively engaged with Vehicles or Troops. Otherwise, they are out of range. Platforms re always out of range.
Attacking Structures, Vehicles, and Troops
Vehicles can engage with Strucuters, Vehicles, and Troops in the normal fashion.