However intended, the 37-day bombing halt failed to prompt peace negotiations. and on January 31. 1966. the U.S. resumed aerial attacks against North Vietnam. USAF and U.S. Navy pilots soon brought practically all of North Vietnam under attack. even though targets in the restricted zones had to be approved in Washington—a procedure that greatly limited the number of strikes near Hanoi. Haiphong. and the Chinese border. On April 1, B-52s on their first raid over North Vietnam dropped 600 tons of munitions on the Mu Gia Pass to interdict forces and supplies on their way to the I-lo Chi Minh Trail. North Vietnam's air defenses continued to claim U.S. aircraft, although in air-to-air battles the victory-to-loss ratio favored the United States. To counter surface-to-air missiles (SAMs). the USAF deployed Wild Weasels. F-100Fs equipped with radar wanting and homing sets to pinpoint SAM radars and mark them for F-104 IRON limo strikes. After April 18. 1966. the Wild Weasels also carried strike missiles that horned on radar signals to destroy the SAM sites.
Between May and July. F-105s replaced F-100s as Wild Weasel aircraft. While the air war escalated in North Vietnam. Allied ground forces required increased air support in South Vietnam. During January and Febnrary 1966. the U.S. Army, in cooperation with the Army of the Republic of Vietnam and other Allied ground forces, engaged the Viet Cong in a series of attacks designed to drive them from long-held areas. The Allied ground forces operated in the Central Highlands near Dak To. a village and airfleld about 280 miles northeast of Saigon; Konturn. the provincial capital 20 miles south of Dal: To; and Pleiku. Allied forces also conducted operations along Highway 19 between Pleiku and Qui Nhon and near Saigon and Tay Ninh. 50 miles northwest of Saigon. These operations called for extensive airlift, aerial resupply, and close air support from the USAF.
To control the growing. diverse air operations in South Vietnam. the USAF on April 1. 1966. activated the Seventh Air Force in place of the 2d Air Division. Its former Commander, Lt. Gen. Joseph H. Moore. assumed command of the Seventh. A few days later. on the 10th. USAF C-130s flew 129 sorties to move an entire U.S. Army brigade from Bien Hoa to Song Be, 60 miles north.173rd brigade conducted seareh and destroy missions in the area before returning to Bien Hoa by air on April 22 and 23.
Although generally successful in search and destroy operations. the Allies did suffer some reverses. Perhaps the most significant was the loss of the South Vietnamese Special Forces Camp at A Shau. on the Laotian border some 30 miles southwest of the old Vietnamese imperial capital of Hue. In spite of USAF close air support with AC-47 gunships and A-1 fighters. the North Vietnamese overran the camp on March 9-10. The enemy subsequently developed the A Shau Valley as a major logistics base with a road network to the Ho Chi Minh Trail.
In Laos the USAF continued to bomb the Ho Chi Minh Trail and provide close air support for Laotian forces battling Communist Pathet Lao and North Vietnamese Army (NVA) troops. ln one engagement. on March 4 and S. the enemy attacked Royal Laotian forces at Attopeu in the panhandle of Laos. about 270 miles north of Saigon. Two USAF AC-47s provided close air support to help break the attack. The USAF also used B-52s extensively to fly more than 400 interdiction sorties over the Ho Chi Minh Trail in Laos during the first half of 1966.
