May 21 in history, these intelligence were sent to the US president

情报历史上的5月21日，这些情报被递交给时任美国总统

Intelligence History on 1962 May 21
Intelligence History on 1963 May 21
Intelligence History on 1964 May 21
Intelligence History on 1965 May 21
Intelligence History on 1966 May 21
Intelligence History on 1968 May 21
Intelligence History on 1969 May 21
Intelligence History on 1970 May 21
Intelligence History on 1971 May 21
Intelligence History on 1972 May 21
Intelligence History on 1973 May 21
Intelligence History on 1974 May 21
Intelligence History on 1975 May 21
Intelligence History on 1976 May 21