How Yuma Proving Ground came to be
From Wikipedia’s history of Yuma Proving Ground.
The presence of the U.S. Army in Yuma goes back to 1850, when Fort Yuma was constructed on a hill overlooking the important Yuma crossing of the Colorado River. Soldiers at Fort Yuma maintained peace and protected the important Yuma Crossing, which was used by thousands of travelers each year.
The Army constructed a second facility in 1865, the Yuma Quartermaster Depot, to act as a supply base for Army posts throughout Arizona and parts of New Mexico. Supplies were delivered by riverboats and transported from the depot to military outposts by wagon. After Fort Yuma and the Yuma Quartermaster Depot closed in the 1880s, the Army did not return to Yuma on a permanent basis until World War II.
Text from Wikipedia, licensed CC BY-SA 4.0.





1975
1975
1975
1975
1975
1975
1986
1987
1994
1994
1994
1994
1994
1994
1994
1994
1994
1994








