 In 1929, he returned to the United States and attended the Field Officers Course at the Marine Corps School in MCB Quantico, Virginia.In 1931, Brigadier General Randolph C. Berkeley appointed del Valle to the "Landing Operations Text Board" in Quantico, the first organizational step taken by the Marines to develop a working doctrine for amphibious assault.In 1932, he wrote an essay titled "Ship-to-Shore in Amphibious Operations" which was published in the "Marine Corps Gazette".