How do I hold focus when lives depend on it?

The stakes are life and death, and holding perfect attention hour after hour frightens you. That fear is not weakness. It is the honest weight of the responsibility, and it is part of what keeps you careful. The person who feels nothing in your seat is the dangerous one. But know the limit of what you are asking of yourself. No human holds flawless attention every second for hours; that is not how minds work. What you can do is build systems that catch you when your focus dips: the checklists, the cross-checks, the procedures that do not rely on you being perfect. They exist precisely because attention is human and fallible. So carry the responsibility without carrying the impossible. Lean on the discipline and the systems that were built for exactly this. And tend your rest, because a rested mind holds attention that a depleted one cannot. Guard your sleep and your recovery like part of the job, because they are.