What was Nixon's military campaign?
1969 - He launched a large bombing offensive against the Ho Chi Minh trail in Cambodia. He failed to break the morale of the NV.
1970 - withdrew 150,000 troops, they could not find the Cambodia headquarters, the communists were strengthened by bombing campaign.
1971 - US morale plummeted, attack on trail in South Laos, ARVN was divided and the troops were fighting to leave Laos.