It varies. From what I've heard, and the fact that it is basically a breast-plate and spandex, a change in wind could take out the standard armor.
Im sure a direct hit from a rocket would cut down an Agile/Stand/Infil soldier.
I have also been told a shot from the Bolt Driver would take out those armors as well.
In the same vain, it'll most likely take a few to finish off say a MAX.
Hope i was of some help.
-The President