Introduced in 1916, the AC was the first Mack truck to feature their familiar sloping hood and dashboard-mounted radiator. The United States Army used Mack AC trucks in World War I, during which time the model was often referred to as the “bulldog” because it was sturdy and strong and its snub-nosed appearance somewhat resembled that of its canine namesake. The description soon grew to encompass all Mack trucks, and the company adopted the Bulldog as its corporate symbol in 1922. This truck features a “feed bed,” which was designed without side rails to facilitate the distribution of hay bales to hungry livestock. Chain drive was standard on the 13,000-pound vehicle, which was capable of carrying a 3-1/2-ton payload.