-1
There is nothing wrong with crowded battalions, that means that there is incentive to join said battalion, and there is enjoyment in being a part of it.
On another note, there is no reason to add another battalion with only a SLIGHTLY different purpose than an already in place one. I feel that if you want to be part of a team that is heavily involved in the usage of shields, and breaching; wait for the squad update, and work something out from there. There is no reason to have an entire battalion dedicated to breaching, when you can just make squads for them.