 He was mortally wounded in this action for which he was posthumously awarded the Navy Cross.In 1931, Brigadier General Randolph C. Berkeley appointed Pedro 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".