The Mack truck replaced the 10 ton, and the International replaced the MLVW (for the Reserves anyways). Two trucks two different but similar roles. One Heavy one medium. Replacing the Heavy and medium trucks we had.Yes, but 1 medium and 1 heavy. Not two different models of the same role. Which you identify also below.
The Mack truck comes in Cargo, Troop, Hook lift, Engineer version etc.