Just a suggestion I thought could be potentially interesting. What if you added stretcher-bearers? Obviously this isn't call of duty. There are no team revives, but what if you get an injured man off the field and you can restore some tickets? Obviously that would be high risk-high reward as if the stretcher-bearers went down they'd cost a few more tickets, but saving tickets could turn the tide of the battle.

In bigger Civil War reenactment events we would use stretcher-bearer to carry "injured" men off the field and when we had enough send them all in as a "new reg" which is what gave me the idea.