They advised U.S. forces on air, antiaircraft, submarine, amphibious, and antisubmarine operations. She embarked naval air squadrons for carrier landing qualifications and antisubmarine warfare exercises. Additional aircraft provided antisubmarine and combat air patrols. Patrol boats were operated primarily for antisubmarine warfare. Destroyer escorts were also useful for coastal antisubmarine and radar picket ship duty. One antisubmarine warfare helicopter squadron was based at Split on the Adriatic coast. Naval aviation antisubmarine warfare was beginning to prove itself in combat. The Mark 45 was a submarine-launched, antisubmarine, antisurface ship torpedo with wire guidance capabilities. Missions included attacks on all types of ground targets, air superiority, and antisubmarine patrols. For six years they developed methods related to antisubmarine and amphibious warfare. Boldly striking at the enemy in spite of continuous hostile air and antisubmarine patrols, Comdr. The airfield was used by the Third Air Force for antisubmarine patrols and training. These ships were designed primarily as antisubmarine warfare platforms. Later, the Japanese Army commissioned two small aircraft carriers intended for coastal antisubmarine (ASW) duties. Her armament was changed in 1954 with her conversion to an antisubmarine carrier CVS-45.