The first generation of military Hummer is: HUMMER, its models: M997, 998, 1025, 1045, 1097, etc., all of the above are A1 series. The second generation is: HMMWV, its models: M997, 998, 1025, 1045, 1097, etc., all of the above are A2 series. Its "secret weapon" is: a mast-type raised axle with a wheel reducer, and an automatic control device with inter-axle and inter-wheel differential locks. When the vehicle is driving on more complex terrain, once When the tire slips, the operating soldier presses the accelerator with his right foot and stops, presses the brake with his left foot, and then slowly releases it. At this time, the torque will be redistributed, and the vehicle will instantly adjust from the slipping state to the high-torque off-road state, and the vehicle will drive out of the predicament. , so the Humvee is called by the US military: the ship of the desert and the tiger of the mountain.