. "The ones who get a white ball serve in a Batall\u00F3n del Servicio Militar Nacional (National Military Service Battalion) composed entirely of one-year SMN conscripts. In certain cities, such as Veracruz and Ciudad Madero, the lottery system also includes a blue ball; whoever draws it must serve in the navy. Military service is also (voluntarily) open to women. Conscripts are trained in basic combat with fire weapons, in one Infantry Battalion."@en . "Conscription in Mexico"@en . . "The ones who get a white ball serve in a Batall\u00F3n del Servicio Militar Nacional (National Military Service Battalion) composed entirely of one-year SMN conscripts. In certain cities, such as Veracruz and Ciudad Madero, the lottery system also includes a blue ball; whoever draws it must serve in the navy. Military service is also (voluntarily) open to women. Conscripts are trained in basic combat with fire weapons, in one Infantry Battalion. Their formation was brought about after German submarine attacks against Mexican oil tankers that were providing fuel and material to the Allies. These attacks eventually caused the Mexican government to declare war on Germany. Mexico sent an expeditionary force, the Escuadr\u00F3n 201, to fight in the Pacific War."@en . . . . .