sentences:  The Caterpillar design did well in testing, and in 1960, the company was awarded a multimillion-dollar contract for developing eight 8-ton cargo trucks, delivered in 1961 and 1962, as well as two 10-ton wreckers and two 2500-gallon tankers in 1962.Another twenty-three units were ordered in 1963, then field-tested in Germany in 1964 and in Vietnam in 1966.Not until 1971 did Caterpillar eventually receive a production contract for 1300 units