1970-Nixon disclosed death of 27 American troops

1971- 12,000 viet troops go to laos
1,000 u.s. planes bomb Cambodia and laos

1972 – most brutal year of the secret wars
Biological warfare treaty assigned

1973 – Vientiane ceasefire agreement divides laos between communists and loyalists
Some 11,000 killed by un exploded American bombs.

1974 – Americans left laos and abandoned some 36,000 lation fighters