The General Patton Military Museum is located in Chiraco Summit, California, which is near an actual desert training center used during WWII.
Here are some photos I took from a road trip a few years ago.
The museum is about 2-1/2 hours east of Los Angeles (approx 150 miles)
There's much to see here. Plan for at least 1-2 hours inside.
There is a restaurant and gift shop within walking distance.