What class of destroyers was first commissioned in 1975?

The Spruance Class of destroyers was first commissioned in 1975 and represents a notable development in U.S. naval engineering. This class of ships was designed to provide a multi-mission platform capable of anti-submarine warfare, air defense, and surface warfare. The Spruance Class introduced significant technological advancements, including improved sonar systems and guided missile systems, which significantly enhanced naval capabilities during the Cold War.

In contrast, other classes mentioned were introduced later. The Arleigh Burke Class, for example, began commissioning in the early 1990s and included improvements in stealth and combat systems, while the Ticonderoga Class cruisers also came into service in the 1980s, designed primarily for air defense and equipped with Aegis combat systems. The Whidbey Island Class, primarily amphibious docking ships, focuses on support roles rather than the multi-role capabilities of destroyers. Each of these classes serves distinct purposes within the U.S. Navy, but the Spruance Class marks the correct answer to the question based on its commissioning date in 1975.