The Lockheed SR-71 Blackbird strategic reconnaissance aircraft, first employed during the Vietnam War. A marvel of technology, it outperformed all of the other military aircraft of its time, attaining altitudes above 85,000 feet and speeds of nearly Mach 3.5.
gunner shot down a MiG on the first night, but 200 surface-to-air missile launches claimed three B-52s―the first 3 of 15 lost.
By December 27 North Vietnam had depleted its supply of SA-2 missiles and much of its antiaircraft ammunition. Interdiction strikes against rail lines and bridges coupled with mines in Haiphong Harbor prevented resupply from China or the Soviet Union. By December 30, LINEBACKER II had destroyed many industrial and military targets in the Hanoi and Haiphong area, although its major impact was on North Vietnam's morale. To Captain Ray Bean, an F-4 crewman imprisoned in the "Hanoi Hilton," the B-52s "got the attention of the North Vietnamese" because the United States seemed to have forsaken precision attacks on purely military and industrial targets in favor of "whole-sale destruction." North Vietnam witnessed the path of devastation a single B-52 could create, especially in an urban environment. Its negotiators returned to the peace talks, agreeing to a cease-fire in January 1973 and signing a treaty in April. Before the year was out Congress cut funds for Southeast Asian operations and passed the War Powers Act, which limited the President's options.
Two years later North Vietnam launched a final offensive against a South Vietnam operating without American air support. After 55 days, on April 29, 1975, Saigon fell. In Vietnam, the United States lost 58,000
