Vietnam ground combat operations in 1965, and at their peak they numbered more than 500,000. The US also engaged in a sustained aerial bombing campaign. Meanwhile, China and the Soviet Union provided North Vietnam with significant material aid and 15,000 combat advisers. Communist forces supplying the Việt Cộng carried supplies along the Hồ Chí Minh trail, which passed through the Kingdom of Laos. The communists attacked South Vietnamese targets during the 1968 Tết Offensive. Although the campaign failed militarily, it shocked the American establishment, and turned US public opinion against the war. During the offensive, communist troops massacred over 3,000 civilians
Dispatched labor employment agencies were not confined to placement services and job placement anymore but the employer could provide laborers to third parties. Second, urged the international society members to attach importance on the flexibility of labor market. Because of the legislation of ILO Convention 181, it spurred big progress in the development of labor dispatching. Regularly Employed：Dispatched work agencies send their regular employed workers to client enterprises to provide labor. The labor contracts between dispatched workers and dispatched work agencies are irregular labor contracts, thus, whether the period of dispatched contracts expire or not, it will not influence the labor relation