On the Global Nerf

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Unfortunately it's luck of the draw - red shirts, maybe a map like Hidden Cave, and you're not going to get far.

As long as you have two commandos, I think you can at the very least reach troopers on Hidden Cave. The inner part of the tower there is a very good spot that can be covered with just two or three guys shielding (at least until you reach the point where sharpshooters are shooting your flank).