The airplane should definitely be included in this list
World War I basically took the airplane from a novelty item, and developed it into one of the worlds most lethal killing machines in the span of a decade.
Demand for improvements between the world wars move the airplane from simple biplanes constructed of wood and fabric and evolved the airplane into massive steel and aluminum four engine bombers with thousands of miles of range.
Within 20 years, the aircraft had evolved to have wingspans of 1.5 to 2 times the total distance of the first powered controlled flight by the wright brothers.
The same cannot really be said for any other piece of militarized engineering
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