F3 gun modernization and deterrent effects

The F3 counterfactual extends into a wider modernization path beyond the two treaty ships. If the 15-inch/50 entered service, Hood, Renown, Repulse, and possibly the Queen Elizabeth and R classes could have received the weapon during later refits. Another 1,000 tons of armour might have increased protection over the engineering spaces and magazines while leaving the ships within the treaty displacement limit. A 28-knot F3 group could also have reduced the burden on Britain's few existing fast capital ships and widened deployment choices. Familiarity with the gun might then have strengthened the case for 15-inch armament in the King George V class. German planners facing several fast British ships with the heavier weapon would have had to consider greater speed, protection, or cost in their own programs. Deterrence here depends partly on the capability an opponent believes it must answer, even without a battle.