How many ballistic missile submarines (SSBN) are there?

The number of ballistic missile submarines, commonly referred to as SSBNs (Submersible Ship Ballistic Nuclear), is crucial for a country's nuclear deterrent strategy. As of October 2023, the United States operates 14 operational SSBNs. These submarines play a vital role in national defense by providing a second-strike capability, ensuring that a retaliatory response can be launched even after a nuclear attack.

The SSBNs are designed to carry and launch ballistic missiles, such as the Trident II (D5). They operate on a continuous at-sea deterrence posture, which means that a certain number of these submarines are always deployed underwater, providing a constant threat of nuclear retaliation. The number of 14 reflects the current operational capabilities, following recent naval strategic assessments and deployments.

In a historical context, there might have been times when the fleet size varied, leading to confusion about the total number of SSBNs. However, the current operational count firmly stands at 14.