Lesson 2: Silhouetting while climbing/rooftopping
One of the hardest things to do in regards to minimizing your silhouette is when you have to scale a fence. One obvious thing to do would be to dig your way under, but of course it has MAJOR flaws in regards to UE.
1 - It takes a LONG time to dig a suitable spot out to crawl under a fence, ESPECIALLY if it's partially buried.
2 - Digging is noisy work! Good way to have a guard wander over and ask what it is that you think you're doing.
3 - It leaves a hell of a lot more evidence than you ever want.
For climbing, I usually stick along areas that either have cover (objects such as trees/bushes or even just deep shadows), or climb along a part of the fence that provides cover itself, such as the hinges of a gate (also provides great footholds, as well as a good handhold to get over any barbed wire).
When you reach the top of the fence, you leave a VERY easily spotted silhouette if you remain upright and swing your leg over to straddle the fence, as most people tend to do. If you aren't confident enough in your climbing ability to do otherwise, you can always keep your body hugged up against the top of the fence to minimize your silhouette. If you have enough upper body strength, you can grip the fence in the same manner (torso aligned with fence), and then pull both legs up and over at the same time. This expedites the climb, and is still quiet enough that it shouldn't attract any extra attention.
Of course, when you're going along rooftops, keep as low a profile as possible, even when you're not near the edge. If you have to go to the edge, use the 'Rushing Step' position mentioned in the first post to keep yourself from being too visible.