At what do you/did you excel in the military?

In my younger days....I excelled at being a smart-ass............hence why it took me so long to finally make SGT.

I did what the soldiers did. I was in the mud, dug fighting positions, performed funeral duty, played flag football every Friday, set up the engagement areas, conducted gate guard with the troops, and BBQed every Thursday, and I did post clean up with them.

Inter-service support issues SPC Margaret Higgins. I became the subject matter expert when I realized there was no consolidated information source. I developed an unclassified information database that was used by HQDA in the budget process.
Later I was tapped to represent Army in the drafting of the DoD Executive Agent directive and after I left the military I drafted a response to Army Chief of Staff whitepaper and was asked to brief the VCSA for two hours on the subject. At the time I was dealing with diverticulitis and heavily medicated but the briefing went very well.