In its various iterations, the Boeing Vertol Company has been a major developer and builder of helicopters. These records reflect development, manufacture, testing, improvement, and sale of helicopters, especially for military use in Vietman. This includes information relating to reports on factories visited, military needs of the United States and foreign countries, sales, conferences, and meetings with military personnel, government agencies, and representatives of foreign countries.

Hughes Helicopters was a manufacturer of civilian and military helicopters. The company was founded in 1947 as a unit of the Hughes Aircraft Co., an aerospace and defense contractor established by Howard Hughes (1905-1976) in 1934. This small collection consists primarily of article reprints that publicize Hughes Helicopters and trade literature for some of the company's competitors before entering the market.