According to these the navy used Biancur Field (Elgin Aux #6) for touch and goes. Site is also called Camp Rudder.
https://en.wikipedia.org/wiki/Camp_Rudder
This link includes information on the Eglin Aux Field:
http://www.airfields-freeman.com/FL/...s_FL_Eglin.htm
Including Biancur:
http://www.airfields-freeman.com/FL/...in.htm#biancur
If you scroll down through the Biancur section, they show an overhead photo of the field which includes a large plane sitting on one of the runways. The plane was there for a number of years. There is an enlargement of the overhead photo which shows the plane a little clearer. They think it may have been a B-24 but it is possibly the B-29.
Unfortunately no close-up photos of the plane.