Camp Ibis 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 440th AAA AW Battalion was activated per General Order No. 1 at Camp Haan, CA on July 1, 1942. It trained at Camp M.A.A.R. (Irwin), Camps Young, Iron Mountain, Ibis, and then Camps Pickett, VA and Steward, GA. The battalion shipped out to England in December 1943 and landed in Normandy on D-3. The unit earned 5 Battle Stars and 2 Foreign Awards while serving with the 1st, 3rd, 7th, and 9th U.S. Armies, the 1st French Army and the 2nd British Army, 7 different corps and 5 different divisions. The 440th AAA AW BN was deactivated in December 1944.ron 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 seen (1985).

Citation from California Office of Historic Preservation