Surely your viewpoint on height depends if your considering your vehicle as being a potential target or an offensive weapon and nature of the terrain/vegetation you're operating in.
As a tank gunner you're taught to aim at the centre of the visible mass so the more you can see, the more target area you have to mitigate any errors in your accuracy.
On the offensive having additional height is an advantage so you can see over hedgerows or cutty grass etc noting you do need to get crest clearance on the main gun if that is the weapon you need to fire.
Paul
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