CH-46 Sea Knight / US NavyBoeing CH 46 H 46 US Navy helicopter model. The CH 46D Sea Knight helicopter is used by the Navy for shipboard delivery of cargo and personnel. The CH 46E is used by the Marine Corps to provide all weather, day or night assault transport of combat troops, supplies and equipment. Troop assault is the primary function, and the movement of supplies and equipment is secondary. Additional tasks may be assigned, such as combat support, search and rescue,