Operation Rolling Thunder
"Operation Rolling Thunder was a frequently interrupted bombing campaign that began on 24 February 1965 and lasted until the end of October 1968. During this period U.S. Air Force and Navy aircraft engaged in a bombing campaign designed to force Ho Chi Minh to abandon his ambition to take over South Vietnam. The operation began primarily as a diplomatic signal to impress Hanoi with America’s determination, essentially a warning that the violence would escalate until Ho Chi Minh "blinked," and secondly it was intended to bolster the sagging morale of the South Vietnamese. The Johnson administration also imposed strict limits on the targets that could be attacked, for China and the Soviet Union were seen as defenders of communism who might intervene if the North Vietnamese faced defeat. Consequently, the administration tried to punish the North without provoking the two nations believed to be its protectors."