The Sikorsky SH-3 Sea King was a large, twin-engine naval helicopter developed for the U.S. Navy primarily for anti-submarine warfare, search and rescue, and utility missions. Entering service in the early 1960s, the Sea King was designed to operate from aircraft carriers and other naval vessels and was equipped with sophisticated sonar and sensors for detecting and tracking submarines beneath the ocean. Its spacious cabin and amphibious hull also made it exceptionally versatile, allowing it to transport personnel and cargo, rescue downed aviators, and perform missions over both land and sea. Sea Kings became a familiar sight aboard U.S. Navy carriers during the Cold War and Vietnam eras and were often assigned to plane-guard duty, standing ready to rescue aircrews during flight operations. Variants of the Sea King also became famous for transporting U.S. presidents as Marine One and for recovering astronauts following early American space missions. With its distinctive boat-shaped fuselage and large five-bladed rotor, the SH-3 Sea King became one of the most recognizable and successful naval helicopters of its generation.