The Boeing CH-46 Sea Knight helicopter has served the US Navy and Marine Corps faithfully since the early 1960s. This venerable aircraft's primary mission areas in the Navy (as the H-46D) include Combat Logistics Support and Vertical Replenishment (VERTREP), Search and Rescue, and Special Operations. As a Marine Corps platform。 The CH-46 “Sea Knight” helicopter is one of the largest helicopters in the US Navy inventory.