As I did this a while ago, I do not have step by step procedure. But here is a quick and simple reiteration.
1/72 (or other scale) figures.
Some sort of base
1. Find a soldier in the crawling position you need and use a pocket knife to alter him/her to your specifications.
2. Paint him/her in the specified colors
3. Put him/her on a base
4. Post it on this so everyone can see your awesome accomplishment!