Actually, the Navy only flies the MH-53 when it comes to that version of the helicopter. However if you are thinking of the MH-53J Pavelow which is the Air Farce combat search and rescue bird then you are thinking the wrong thing. The Navy flies the MH-53E which delivers cargo, functions as a mine countermeasures aircraft by towing a huge mine countermeasures sled and other things like that. It can do search and rescue but it doesn't have all the gucci toys and weapons that the Pavelow has.