A tour of the heaviest military machines ever built, from super-heavy tanks and rail guns to record-setting bombers, submarines, battleships, and modern aircraft carriers—each compared to the weight ...

In military service, reliability is priceless, at least until the bill comes due.

The additional vehicles are part of the previously announced firm-fixed price $296 million contract over seven years that the Army awarded Mack Defense in 2018, which allows for up to 683 trucks. For ...