If you mix a psion in there to feed your Serial sniper an action, you can use the action to reload and get potentially more than 6 kills.

One other thing to note also, which may be unintuitive and not something you would recommend to someone who is risk-averse, but the Advanced Warfare room may be a higher priority pick than the Guerilla Warfare School. Not including the medical benefit of doubling soldier wound recovery for posting an engineer, it…