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 out of 10 laborers were hired by dispatched work agencies. In addition, according to the statistics of America Staffing Association, 90% of American enterprises used the services provided from labor dispatching industry. This illustrated how ingrained the concept of labor dispatching had become in American society. In Japan, since making the law of labor dispatching in 1985, labor dispatching developed rapidly, leading to the development of 615 general dispatched work agencies, 3,266 specific dispatched work agencies, and 1.4 billion dispatched laborers. As of 1998, there were 3026 general dispatched work agencies, 6985 specific dispatched work agencies, and 9 billion dispatched