What type of submarine is categorized under the SSBN classification?

The classification of submarines as SSBN refers specifically to "Ship, Submersible, Ballistic, Nuclear." This type of submarine is designed primarily to carry and launch ballistic missiles that are capable of delivering nuclear warheads. The primary mission of an SSBN is strategic deterrence; they are a vital component of a country's nuclear triad, providing a survivable second-strike capability.

SSBNs are equipped with missile silos and are often designed to be stealthy and able to operate undetected, allowing them to remain submerged for extended periods. Their nuclear propulsion allows them to travel vast distances without the need for frequent surfacing, making them effective platforms for deterrence and power projection.

In contrast, attack submarines are designed for offensive missions like hunting other submarines and surface ships rather than carrying out nuclear deterrence missions. Research submarines serve the purpose of exploration and scientific research, while landing submarines are associated with transporting troops and equipment for amphibious assaults. Thus, SSBNs stand out as specialized vessels within the broader category of submarines due to their unique strategic role.