Zilch, take a pack of erasable pens with you. They make writting an Essay so much easier because:
1. you can change your mistakes.
2. If you come in a couple words over/under you can go back and change a few things instead of rewritting the whole thing.
Also humor is bad, but eclectic history is good depending on the SI. Just remember they have google and a dictionary so dont go pulling stuff out of thin air. I did an essay on proper recognition of rank and I ended up blowing 200 words on the stuff like where the term Lance Cpl came from. After that, my one SI and platoon commander kept asking me wierd history questions from then on out because it turned out they were history buffs.
Sidenote: Col Chase is a huge history war buff. (Straight from his nephew's mouth)