Whatever do they all do?
Some years ago I was on a USN staff. We had 12 front line squadrons, 2 main operating bases, 4 deployment bases each with a full squadron deployed, numerous other minor detachment bases, a conversion squadron with 32 aircraft and we were lead by a junior 2 star admiral plus a one star commodore. The equivalent organisation in the RAF had 2 bases, 4 squadrons and a conversion unit (all smaller than their USN equivalents) and was headed up by a three star plus 3 two stars to back him up.
I would like to think the situation has changed, but I doubt it