You are commander, scouts ally, You are able to buff scout by allowing him to shoot faster.

Scout is placed down, You are watching from the inventory as the player begins placing farms, Scout is struggling alot against the abnormals on wave 1, after a while, (around wave 15) you are placed down and you are upgraded to get Call Of Arms, There is also 3 other scouts, they all are level 3. "Hello! Nice to have some support!" Scout says as he shoots zombies