How do I push the mission hard without wrecking myself or my team?

You tell yourself the mission comes first. Fine. But ask what "first" has come to mean. Has it become an excuse to skip sleep, skip rest, skip the honest conversation about what your team can carry? That is not devotion. That is avoidance wearing a noble coat. No cause is served by people who break. A team that runs itself into the ground produces less, not more — worse decisions, slower work, quiet resentment. You know this. You have watched it happen to others and called it dedication. Look again. The real question is not mission versus rest. It is whether you can tell the difference between what the work truly requires today and what your own fear of falling short is demanding. One is real. The other is a story you keep telling yourself.