Camp Roberts Soldier’s Bowl:

The Soldier Bowl, Camp Roberts’ huge outdoor amphitheater, was officially completed on August 30, 1941 according to building records, at a cost of $6,730.00.  It included a Spanish Mission-style façade backdrop with adjoining entrance wings, dressing rooms and toilets.  An historic iron mission bell from the Mission San Miguel de Archangel in San Miguel was given to Camp Roberts and installed in the bell tower—the highest point of the entire structure.  The giant hillside bowl was dedicated and officially presented to the “men of Camp Roberts” with a sparkling under-the-stars pageant on Friday evening, September 12th, 1941.

http://californiamilitaryhistory.org/CampRobertsSoldierBowl.html