Camp Hyder was a US Army installation in Arizona, functioning as a subcamp of the Desert Training Center in Riverside County, California. The main headquarters for the Desert Training Center was Camp Young, this is where General Patton's 3rd Armored Division was stationed. Camp Hyder is 2 miles (3.2 km) miles south of Hyder, Arizona. The camp was just north of the Gila River. Camp Hyder is 60 miles (97 km) miles east of Yuma, Arizona, near Camp Horn. Camp Hyder was built at the site of an old 1890s military base. Trained at Camp Hyder, in 1943, for six months was the 77th Infantry Division from April 1943 to September 1943. Then the 104th Infantry Division moved in for training. Unlike the other camps, no large tank activity was done. The camp was built by The 369th Engineer Regiment. Camp Hyder had its own rail station at which most troops arrived. The train station at Sentinel, Arizona south of the camp was also used. Over 13,000 troops were trained at Camp Horn and Camp Hyder.

The Desert Training Center (DTC), also known as California–Arizona Maneuver Area (CAMA), was a World War II training facility established in the Mojave Desert and Sonoran Desert, largely in Southern California and Western Arizona in 1942.