>>520818826
After getting busified they're mentally broken to submit.
Then they're promised they won't have to do much, just sit tight in some quiet part of the front.
They are issued weapons only when they're closer to the front line.
By then many have already bonded and wouldn't leave their comrades behind.
A mrap then unloads them at or close to the zone where remaining in the open is death sentence, then floors it.
Can't retreat because 2nd line of defense are the soulless drone operators who will kill you without a second thought.