From the Guidebook:
Iron Mountain Divisional
Camp was established at this site in the Spring of 1942.
One of eleven such camps built in the California-Arizona
Desert to harden and train United States troops for service
on the battlefields of World War II. The first major unit
trained here was the 3rd Armored Division followed by
elements of the 4th, 5th, 6th, and 7th Armored Divisions.
In all, one million men trained in the desert before the
Training Center was officially closed in May of 1944.
The most unique feature built at this camp is the huge
relief map built into the desert floor. It can still be