Eglin is a about 10 miles inland and that makes all the difference. Tyndall was like Patrick, with the flightline running right along the beach.
Keesler is pretty close to the Mississippi beach and has suffered storm damage several times. Heck, it's one of the Hurricane Hunters' bases.
USAF will maintain the same level of presence along the coast regardless of base locations. It's a practical necessity in order to train at Mach 1+.