Orbital Icon selection?

Really a minor thing, but I'm curious if some of the icons in the UI could use some re-thinking.

They were a bit confusing to learn at first. 

A few quick thoughts:

1. Plasma storm icon should look a bit more cloud-ish.

2. Laser-cutter icon should look a little more like the equivalent building.

3. Fist is very cool, but doesn't screen "drop eight units here"

4. Guard icon should be a picture of the guard unit