If you mean the air force base, it's about 18 miles.
It is 268 miles from Fort Sam Houston to Dallas, TX.
The driving distance between Fort Sam Houston TX and Houston TX is 196 miles per Map Quest. The driving time per Map Quest is 2 hours and 58 minutes.
It is 271 miles according to Google Maps.
211.8 miles
The driving distance is about 265 miles.
About 200 miles
About 265 miles
1165 miles
The shortest driving distance is 741 miles.
I can't find any actual proof to what specific company he was with, but I trained in that battalion myself and everyone said he was in Foxtrot.
There are several Army Posts in Texas. The term is Post for Army installations while Base is used for Air Force installations. Ft Hood, Ft Sam Houston and Ft Bliss are Army Posts in Texas. See related links for an Army Installation locator.
Roughly 747 miles, or a 12 hour drive.