I make this proposal to you now with a specific sense of urgency arising from the imminent New Year holidays in Viet-Nam. If you are able to accept this proposal I see no reason why it could not take effect at the end of the New Year, or Tet, holidays. The proposal I have made would be greatly strengthened if your military authorities and those of the Government of South Viet-Nam could promptly negotiate an extension of the Tet truce.
Letter to Ho Chi Minh (1967)