It's not quite that simple. You need a bunch of MLS facilities just to operate the aircraft, mission plan and train, etc. This is something that existing AD bases are already way behind on. Replicating those facilities is cost prohibitive.
Your second paragraph makes no sense to me. This has nothing to do with training for the boat.
It's not like guys live in the same place as their squadron. Lessening the cost burden to the Navy (Or AF, or Marine Corps) by creating/moving existing Guard/Reserve units to where it makes sense to centralize those facilities, and everyone who uses those facilities pays into the funds to build them seems to make sense to me.
Second paragraph was a complete second thought.