I made this two years ago(16.04.2011 to be precice) when I was still in the Airforce(changed over to the army now) after reading this article[link].
It was a weekend, I had nothing to do, so I ran down to our companys lecture room and "improved" the chalkboard. It was pretty much my first pony picture ever and it took another year until I started drawing on a regular basis.
For those who wonder what is written on the left:
Topic:
Lead: KPChef=Kompaniechef=Company Commander
Realization/Execution:
Time:
Sources: ED= Equestria Daily

Rank Insignia are that of an "Oberfeldwebel" what would be a Staff Sergeant in the US