A captain who says “that one’s on me” gives the whole team permission to own their mistakes too.

Ownership travels downward. When the person with the most standing takes a mistake without hedging, they demonstrate that admitting one is survivable here, and everyone else quietly recalculates what honesty costs. Without that, people hide errors until the errors get expensive. Nothing else you say about accountability does as much work.

Take one thing that partly went wrong and name your part first, without balancing it against anyone else’s. Do it early and keep it short. Then move to the fix, so the room learns that owning something is the start of the work rather than a punishment.