Which class of ship does NOT carry the AN/SQQ-89 Combat System?

The Virginia class submarines do not carry the AN/SQQ-89 Combat System because this particular system is specifically designed for surface ships. The AN/SQQ-89 is a sonar system used by surface vessels for anti-submarine warfare and is integrated into class ships to enhance their capabilities in detecting and engaging underwater threats, primarily submarines.

The other classes mentioned—Oliver Hazard Perry class frigates, Arleigh Burke class destroyers, and Ticonderoga class cruisers—all have the necessary systems and equipment to incorporate the AN/SQQ-89, given their operational roles in surface warfare and anti-submarine operations. Therefore, it is the Virginia class submarines that are excluded from carrying this combat system, as they are designed with different operational requirements and sensor systems tailored for submerged operations rather than surface engagements.