Interdasting Anon. Lived in the area whole life, I can tell you that Norton used to be an AF base. I believe it was one of the bases closed under Clinton’s purge of AF bases.
The Air Force's successful cleanup of environmental contamination at the former Norton Air Force Base has jumpstarted redevelopment at what's now known as San Bernardino International Airport.
Norton - Streamlined for Success
For most of its operational lifetime, the former Norton Air Force Base did its share of heavy-lifting for military missions around the world. Now the former base is flexing its muscles as an economic staple of Southern California's Inland Valley region.
The former Norton Air Force Base, now known as San Bernardino International Airport, has been transformed into a flourishing business complex where huge modern buildings have replaced military structures. Several thousand civilians work at the former 2,221-acre base, arriving daily for jobs in aviation, manufacturing, distribution and logistics.
A three-story customs building was still under construction in late 2011. U.S. Customs and Border Protection have operated at the airport since 2006. SBIA is a Foreign Trade Zone, offering federal tax incentives to businesses locating there, and a Local Agency Military Base Recovery Area (LAMBRA) Enterprise Zone, allowing California tax credits to qualifying businesses operating there.
Many businesses there now.
https://www.afcec.af.mil/Home/BRAC/Norton/Norton-Today/