1. Go to the middle of the map (B flag/B bomb area). Look for the forklift. Get on the green crates by the forklift, get on the highest part of the forklift. Do a quick run and jump to the catwalk. Move to the right and jump onto the white boxes protruding from the buildings there to get up top. This is easy and useful.

2. The warehouse in the south has a box suspended in the air. Climb the steps, jump onto the suspended box, jump to the highest brown crates along the northern wall. Aim your reticule at the highest rail of the catwalk (facing west), do a quick run and jump to get up there. This could occasionally be helpful, but not too often (Medium difficulty jumps).