EDIT: Sorry, I cannot seem to post the picture so it's on a directlink instead.
Caption: "Apparently calling cadence, the North Korean Communist military policeman, at right, stands to the side of the read leading to the Panmunjom military armistice site on Oct. 28, 1951, as two armed Communist military policeman march in single file. Both, American and Communist military policemen spread about the Korean neutral zone, keep their eyes open for possible violations of the U.N.-Communists sire agreements."