April 1 in history, these intelligence were sent to the US president

情报历史上的4月1日，这些情报被递交给时任美国总统

Intelligence History on 1963 April 1
Intelligence History on 1964 April 1
Intelligence History on 1965 April 1
Intelligence History on 1966 April 1
Intelligence History on 1967 April 1
Intelligence History on 1968 April 1
Intelligence History on 1969 April 1
Intelligence History on 1970 April 1
Intelligence History on 1971 April 1
Intelligence History on 1972 April 1
Intelligence History on 1974 April 1
Intelligence History on 1975 April 1
Intelligence History on 1976 April 1