5 kph is pretty slow really - patrol speed which is slow enough to allow proper awareness of your surroundings.
Faster than that is quite possible (I've done around 10 kph fully loaded), but awareness drops dramatically and fatigue becomes much more of an issue. You REALLY don't want to be doing that sort of speed for more than a couple of hours.
Slower and you tend to get bored (again with a drop in awareness) EXCEPT in close terrain such as urban or jungle. In REALLY close terrain (can't see more than a two or three dozen metres at best) you might be lucky to do 5 km in a whole day though!
And then you add in the effect of hills, swamps and other obstacles....
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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