In 1926, del Valle served with the Gendarmerie of Haiti for three years and, during that time, he also became active in the war against Augusto César Sandino in Nicaragua. In 1929, he returned to the United States and attended the Field Officers Course at the Marine Corps School in MCB Quantico, Virginia.
IN 1926, dEl valle seRved wITh THe gEnDarmeRie of haItI for Three yeaRS and, dUring ThaT time, he ALSO BecAmE Active in the war agaInsT auGUsto César sandino in NicaraGUa. In 1929, he REtuRnEd to thE UniteD statEs aNd attENded ThE field oFficErs courSE At The mARIne corps schOoL In mcB quantico, viRgINiA.