Camp Seeley' was a United States Army World War II training camp near El Centro, California in the Imperial Valley. At Camp Seeley was: the Camp Seeley Combat Firing Range, Camp Seeley Ordnance Desert Proving Ground and Camp Seeley Ordnance Training Center. The 17,574 acres Camp Seeley was 10 miles northwest of the City of El Centro, near the city of Seeley, California. The town is named after Henry Seeley, a pioneer of the Imperial Valley. The camp was north of what is now California State Route 98. The tent camp, in the Yuha Desert, opened November 1940, first based at the camp was the 11th Cavalry Regiment, the troops and Army horse came from the Presidio of Monterey, California. At the camp the 11th Cavalry Regiment took part in desert training and teaching horses to swim across rivers with rider. 11th Cavalry Regiment moved to Camp Lockett at Campo, California in December 1941. The 11th and 28th Cavalry Regiment also trained at the camp, along with the 75th Horse Field Artillery Battalion. In 1942 Camp Seeley was converted to a US Army ordnance proving ground. While the camp is closed the area of Camp Seeley the home of the Historical "The Colonel's Own." 11th Cavalry Horse Honor Guard.