The military post office is Office No. 67. The Ministry of Transportation and Communications issued the 'South China Sea Islands Map Stamps' in 1996, as a set of two stamps. The inscription 'South China Sea Defense' from the national stone tablet on Pratas Island was printed on the five-dollar stamp, and the 'Defend the South China Sea' inscription from the national stone tablet on Taiping Island was printed on the seventeen-dollar stamp. The background was the south China coastline, Taiwan and Hainan Island with the blue sky and sea. This was the first time that the ROC had issued stamps with the theme of the South China Sea.