Abbot could have 250K armed texan volunteers in 72 hours if he put out the call
But one has to be ready for that (logistics).
Also, he wants control of these people and command structures in place. Can't have some radical elements (or Fed Larpers) causing trouble
I think he already did that when he used the phrase "..other Texas personnel.." in his original letter.
I’m sure they have their own tents, campers, RVs, etc.