At the same time, the arrival and growing use of automobiles led to various individuals pioneering cross-USA vehicle trips, followed by the first transcontinental trips by whole "convoys" of vehicles. After the U.S. Army purchased its first truck in 1907, of 5-ton payload capacity, in the late summer of 1913, the Army Medical and Quartermaster Corps (QC) took a 3/4-ton QC field-truck, on a multi-leg experimental trek through Alaska for the state's Road Commission – both to try the truck's bad-road supply and maintenance abilities, "and" test the state of several important overland connections in the rough territory. In 1915 followed the first successful transcontinental motor convoy, traveling the entire Lincoln Highway, from New York City to the Panama-Pacific World Exhibition in San Francisco, taking four months – for making a film about it.