Hi,
I lived in Orange County for 12 years. A friend who is a geologist said an area in California was where General Patton trained his troops. There are many military artefacts buried. I can't remember the location and all my reference material is packed. However, if you do a little research, you should be able to find this location. I recall it's either off the I-15 toward Barstow, or it's off the I-10 on the way to Phoenix. Sorry I don't have the exact info, but an online search should help. Good luck!