Originally Posted by deiguer

I brought a letter from HR verifying my employment
a letter from my manager describing my responsabilities ( i wrote it and she reviewed and signed it)
then a small paragraph explaining why if went out of the US without AP and were unable to come back how it would affect the company. I listed like 6 things, such
they would lose an experience employee, would have to hire and train some one else
projects I was currently involved be would be delayed
some deliverables to actual clients would be missed or at least late
my team would be negatively affected as it would lose one key member


I also brought the letter for my visa appointment letter, this was based on a petition from my employer filed a while back (I-140, + 601A + consular interview), which was the main reason why I needed to go, to attend this. Otherwise, there was no need for me to travel. So yeah it was a long shot for me, but it worked. I guess for you, you would need to have something that is making it "necessary" for you to travel.
let me know if you need any other info.