Hanoi Radio reports that captured American pilots have been paraded though the streets of Hanoi through jeering crowds.

The U.S. intensifies bombing raids against portions of the Ho Chi Minh trail winding through Laos.

Operation Hastings is launched by U.S. Marines and South Vietnamese troops against 10,000 NVA in Quang Tri Province. This is the largest combined military operation to date in the war.

For the first time, the U.S. bombs NVA troops in the Demilitarized Zone, the buffer area separating North and South Vietnam.

U.S. jets attack two South Vietnamese villages by mistake, killing 63 civilians and wounding over 100.

Hanoi announces China will provide economic and technical assistance.

While visiting Cambodia, French President Charles de Gaulle calls for U.S. withdrawal from Vietnam.

500 U.S. jets attack NVA supply lines and coastal targets in the heaviest air raid of the war to date.

During Operation Attleboro, 20,000 U.S. and ARVN soldiers conduct a successful search-and-destroy mission 50 miles north of Saigon near the Cambodian border. 155 Americans are killed and 494 wounded while 1,106 VC/NVA are killed.

The U.S. reveals jungles near the Demilitarized Zone are being defoliated by sprayed chemicals.

The U.S. 1st Air Cavalry Division conducts Operation Irving to clear NVA from mountainous areas near Qui Nhon.

The Soviet Union announces it will provide military and economic assistance to North Vietnam.

President Johnson conducts a conference in Manila with America's Vietnam Allies; Australia, Philippines, Thailand, New Zealand, South Korea and South Vietnam. The Allies pledge to withdraw from Vietnam within six months if North Vietnam will withdraw completely from the South.

President Johnson visits Cam Ranh Bay.

Defense Secretary McNamara is confronted by student protesters during a visit to Harvard University.

The New York Times reports that 40 percent of U.S. economic aid sent to Saigon is stolen or winds up on the black market.

North Vietnam rejects a proposal by President Johnson for discussions concerning treatment of POWs and a possible exchange.

Under pressurefrom journalists over mounting civilian causalities in North Vietnam, the U.S. Defense Department now admits civilians may have been bombed accidentally.

The U.S. mounts a large-scale air assault against suspected Viet Cong positions in the Mekong Delta using Napalm and hundreds of tons of bombs.

U.S. troop levels reach 389,000 with 5,008 combat deaths and 30,093 wounded. American Allies fighting in Vietnam include 45,000 soldiers from South Korea and 7000 Australians. An estimated 89,000 soldiers from North Vietnam infiltrated the South via the Ho Chi Minh trail in 1966.

Operation Bolo occurs as 28 U.S. Air Force F-4 Phantom jets lure North Vietnamese MiG-21 interceptors into a dogfight over Hanoi and shoot down seven of them. This leaves only nine MiG-21s operational for the North Vietnamese. American pilots, however, are prohibited by Washington from attacking MiG air bases in North Vietnam.

Operation Cedar Falls involves 16,000 American and 14,000 South Vietnamese soldiers clearing out Viet Cong from the 'Iron Triangle' area 25 miles northwest of Saigon. The Viet Cong avoided the fight and retreated into the jungle, leaving Allied troops to uncover and destroy an extensive network of tunnels. After the American and South Vietnamese troops leave the area, Viet Cong return and rebuild their sanctuary. This pattern is repeated throughout the war as Americans utilize 'in-and-out' tactics in which troops arrive by helicopters, secure an area, then depart by helicopters.

U.N. Secretary-General U Thant expresses doubts that Vietnam is essential to the security of the West.

In his State of the Union address before Congress, President Johnson declares "We will stand firm in Vietnam."

Antiwar Senator J. William Fulbright publishes a book critical of American Vietnam policy. "The Arrogance of Power" advocates direct peace talks between the South Vietnamese government and the Viet Cong.

President Johnson states there are no "serious indications that the other side is ready to stop the war."

American religious groups stage a nationwide "Fast for Peace."

A truce occurs during Tet, the lunar New Year, a traditional Vietnamese holiday

Following the failure of diplomatic peace efforts, President Johnson announces the U.S. will resume full-scale bombing of North Vietnam.

22 U.S. and four South Vietnamese battalions conduct the war's largest operation, Junction City, to destroy the NVA's Central Office headquarters in South Vietnam. The offensive includes a parachute assault by the 173d Airborne Brigade. It lasts until 14 May 67.

Congress authorizes $4.5 billion for the war.

President Johnson meets in Guam with South Vietnam's Prime Minister Ky and pressures Ky to hold national elections.

2,500 Viet Cong and NVA attack Quang Tri City.

Richard M. Nixon visits Saigon and states that anti-war protests back in the U.S. are "prolonging the war."

Anti-war demonstrations occur in New York and San Francisco involving nearly 200,000. Rev. Martin Luther King declares that the war is undermining President Johnson's Great Society social reform programs, "...the pursuit of this widened war has narrowed the promised dimensions of the domestic welfare programs, making the poor white and Negro bear the heaviest burdens both at the front and at home."

U.S. bombers target Haiphong harbor in North Vietnam for the first time.

General Westmoreland condemns anti-war demonstrators saying they give the North Vietnamese soldier "hope that he can win politically that which he cannot accomplish militarily." Privately, he has already warned President Johnson "the war could go on indefinitely."

Hill fights rage at Khe Sanh between U.S. 3rd Marines and the North Vietnamese Army resulting in 940 NVA killed. American losses are 155 killed and 425 wounded. The isolated air base is located in mountainous terrain less than 10 miles from North Vietnam near the border of Laos.

Ellsworth Bunker is appointed U.S ambassador to South Vietnam.

British antiwar activist and philosopher Bertrand Russell organizes a mock war crimes tribunal in Stockholm to condemn the USA.

Robert W. Komer, a former CIA analyst, is appointed by President Johnson as deputy commander of MACV to form a new agency called Civil Operations and Revolutionary Development Support (CORDS) to pacify the population of South Vietnam.

A New York City fire captain leads a 70,000-person march in support of the war.

Operation Junction City which commenced 22 Feb 67 ends with 2,728 Viet Cong killed and 34 captured. American losses are 282 killed and 1,576 wounded. NVA were forced to relocate their Central Office headquarters inside Cambodia to avoid capture.

U.S. and South Vietnamese troops enter the Demilitarized Zone for the first time and engage in a series of fire fights with NVA. Both sides suffer heavy losses.

President Johnson publicly urges North Vietnam to accept a peace compromise.