There's no noise other than gravel shifting below the tires and rocks occasionally tapping the skid plates.High Gear Media
When you're slinking behind enemy lines, the last thing you want is to be detected.
For the U.S. Army's Tank Automotive Research, Development and Engineering Center (TARDEC), the next step in military vehicle technology marks its location with only a hint of water dripping out of its tailpipe.
The only sound you'll hear as it approaches is the crunch of the ground beneath its big mud tires. And its heat profile is almost invisible to infrared cameras.
The Chevrolet Colorado ZH2 hydrogen fuel-cell electric truck is quite a departure from the rumbling diesel Humvees long emblematic of the Army.
Source: http://www.businessinsider.com/take-a-look-at-the-us-armys-chevy-colorado-zh2-2017-7
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