Libby Tanker Base is in Sierra Vista, AZ and is on the Ft. Huachuca Army Base. It's the southernmost base, only 15 miles from the Mexican border. At three miles long, it's one of the longest runways in the nation and serves as the backup landing zone for the space shuttle. Our employees at the base get to watch F-16s, C-17s and a host of UAVs land and take off while they're working.