Rogue Planet review (10) The army building is only a little less weird. That's because your first decision - whether to stay with the Light infantry profile or pay for Medium and Heavy - is purely about staying power. And that deals with the weird HP system. Each unit, powered weapon, and power armor contributes to it, and when a unit is hit, you can choose to expended energy to keep them going. Finally, a game where you have choice when it comes to casualties!