Earlier this year, the US Army announced the three finalists for the massive contract to replace the iconic Humvee, which has been in service for almost three decades.

Oshkosh Corporation, defense contractor Lockheed Martin, and Humvee-maker AM General each delivered 22 prototypes of their Joint Light Tactical Vehicles (JLVT) to military evaluators, who are running elaborate tests on the vehicles to determine the best fit. 

Since the 1990s, AM General's Humvee has been the US military's workhorse, first seeing action in the Gulf War. 

Despite its ubiquity, the Humvee has caused some serious headaches for American forces. As Wired notes, the Humvee was designed in the 1980s as an off-road carrier to transport troops and equipment quickly across Eastern Europe in a theoretical ground war against the then Soviet Union.