hello from a noob here,
Today i wanna post my training set for a trooper class.
First, i prefer to set this troop as a provoker (by set a provoker equipment or just set a lightweight weapon to him). Why? Because this will keep my long-range attacker (sniper, gunner or other) from enemy shots. This will be a primary defence for mission or clash mode battle, as long as there are none of your allied troops in the enemy range (except the provoker troop or the supports).
We can also provide more supports (scout, el-commandante, commander or spy) to keep him stands in a battle.
A trooper class will always accepting the enemy shoots, so we'll need more health point and defence to keep him in a battle.
Just train your trooper class with more Health or Armor (+2) while keep Accuracy and Attack (+1).
Also, keep in mind that "war is about money", more money, more chance that we'll have. Always upgrade your cash device (i prefer an unlimited level for this one decoration in my base, they look so cool).