Fatigue is no joke! But hey, no reason we can't talk about OG tabletop Battletech or the books a bit. I reread a couple of the books recently, actually. As an adult reading them, definitely not as good as I thought they were when I was a kid. An adult perspective on The Clans, for instance is... less favorable. Their society makes no sense. Ostensibly they do this ritualistic bidding system for warfare to minimize the damage inflicted to either side so things don't escalate too far. But that's not how warfare works. Carefully adjusting your assault force so that you can just barely overcome the defenders will maximize casualties, not minimize them. They also have live-fire combat in the place of a promotion evaluation:
Every single mechwarrior earning their stripes must destroy a mech in actual combat. This means for every mechwarrior they train and recruit, a 50-100 ton engine of destruction must be built and destroyed. They face off against three opponents, already-proven mechwarriors from their own clan. Destroying two of them promotes you to a command position over a small unit. All three, a bigger unit. This means almost universally that the candidate warrior will have his own mech destroyed as he tries to ascend the ranks by eliminating at least two opponents. If he succeeds, well, another machine or two destroyed. This is a tremendous waste of resources, and that's not to mention that some percentage of these pilots will simply be killed in the trial. And now command is decided on direct combat skill (and luck). Not experience. Not leadership capacity. If you shoot two dudes down, you get to be in charge.
And that's just the very basic structure of how their military personnel are recruited and promoted. There's numerous other ways their society approves of killing each other. Imagine the US Marine Corps had a list of scenarios in which you are allowed, even encouraged, to battle your fellow marines to the death.