[Boomzor]

Avoid moving/advancing along the summit of ridges, hills and rocks (or even roof tops if you're Light Assault). Sure, you have a nice view from up there but your silhouette stands out like a sore thumb and every one down there can see you if you see them.

If you do have to go over the top to recon, try to do it where rocks, boulders, vegetation or urban greeble is right behind you to hide your silhouette.