After a 36-hour respite for Christmas, the U.S. resumes Operation Linebacker II. The extensive bombing campaign was resumed because, according to U.S. officials, Hanoi sent no word that it would return to the peace talks.
On December 13, North Vietnamese negotiators walked out of secret talks in Paris with National Security Advisor Henry Kissinger. President Nixon issued an ultimatum that North Vietnam send its representatives back to the conference table within 72 hours "or else." The North Vietnamese rejected Nixon's demand and the president ordered Operation Linebacker II, a full-scale air campaign against the Hanoi area that began on December 18. During the 11 days of Linebacker II, 700 B-52 sorties and more than 1,000 fighter-bomber sorties dropped an estimated 20,000 tons of bombs on North Vietnam--half the total tonnage of bombs dropped on England during World War II.
Also on this day: U.S. headquarters in Saigon announces that American military strength in South Vietnam was reduced by 700 men during the previous week. The reduction brought the total U.S. forces in South Vietnam to 24,000, the lowest in almost eight years.