Replacement timing is an uncertainty problem

Delay is a genuine gamble rather than a simple mistake. More time can reveal the missions and technology a future class must meet, improving the chance that it serves well for the next thirty years. The same delay can leave a navy without suitable ships if war arrives before the replacement is ready. History can show nearly identical choices producing success in one case and failure in another, frustrating the demand for a certain rule. Decision-makers often gain certainty only after events produce casualties, while procurement aims to prevent that outcome by presenting credible capability and raising the expected cost of aggression. Deterrence still cannot guarantee restraint from leaders who seek conquest, prestige, or a supposed historical destiny regardless of the forces facing them.