Everyone always makes a big deal about the tank squeak...one of the biggest indicators of tanks, believe it or not, is visually and not audible. The big plume of diesel exhaust as the engine revs up when the tank starts up slope for example. A sharp-eyed scout can see the exhaust plume almost a kilometer out with just a pair of binos, toss in thermals...and the sighting range can open up to 2-3 kilometers depending on ambient temp.
Of course, there is the old standby. The grizzled ole sarge steps out of the scout track and places his hand on the ground..."heavy armor moving, three clicks thataway!"
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The reason that the American Army does so well in wartime, is that war is chaos, and the American Army practices chaos on a daily basis.
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