Texas should consider using the facility that was called “Medina Base Facility” in the 1960’s, near or in San Antonio. It was part of the NRC, Nuclear Regulatory Commission in the early 1960’s or late 50’s, then part of Lackland/Kelly AFB. There are many igloos there, which were used to store nuclear explosives from Kelly’s B-52’s. They are concrete structures, with massive steel doors, and buried under dirt piled on top (and guarded by rattlesnakes, scorpions and tarantulas). I worked there in the 60’s.
It’s still in use as a training facility.