In March 1955, the South Korean national assembly unanimously passed a resolution that NNSC inspection teams should be expelled from South Korea. In May 1955, the U.S. decided that the NNSC should be told that its operations were seriously disadvantaging the UNC forces, and that the "UNC proposed in future to regard Article 13(d) of Armistice agreement as inoperative". In August 1955, South Korean President Syngman Rhee demanded NNSC members leave South Korea, and 1,200 railway workers and 300 South Korean war veterans tried to storm the Wolmi-do Island NNSC compound, but were held back by several hundred U.S. troops using tear gas. Demonstrations against NNSC inspection teams continued through September and October.