Ah, yes. Good ol' Aerojet. I grew up in Chino Hills, CA near the base of their operation there. As a kid, playing in the gullies around the area, we didn't really question the sounds of munitions in the background during the day--until we became teenagers and started exploring it.

After a few friends retrieved spent (and unspent) mortar shells, it quickly was guarded and a project to clean up the site was initiated.

These fine folks have been following the closure, cleanup and build over of the facility for some time: https://www.enviroreporter.com/investigations/aerojet-chino-...

For the low price of only $3.5M, you too can own a nice house on a toxic waste site: https://www.zillow.com/homedetails/2276-Celano-Ct-Chino-Hill...