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The Rhodesians and others in southern African countries like Namibia were masters at boxing and killing, often using helicopters to leapfrog. The Rhodesians made it an art. The British and our own Army used to be masters at this, but now we can hardly tie our tracking boots.
The Rhodesians would get on track, often simply by flying in helicopters and looking for it in grass or other opportune traps, especially during morning or evening patrols. You simply cannot move through many sorts of grass without making a color change.
You can try to hide track from air observation, and it can help, but that wastes time in the open. If numerous men go single file, there is no way to hide it. If they spread out, they leave more trails. Real accounts of combat tracking against good anti-trackers sound like a Tom Clancy submarine story. The submarines cannot see each other, but they can sense each other through various means. Even the stealthiest submarine creates disturbance.
Luckily our enemies don't read history and we've got FReepers hawking articles like this.