Hmm...maybe a symptom of my browser issues, but I wasn't able to tab over and add a signature in that part of the letter (above where it digitally stamps your DoDID/name). It looked awful left-justified so I just let the digital signature stand on its own. Just glad I was able to get it submitted. All of this discussion on ESSBD leads me to believe that if it mattered that much, there would be better direction or a better example provided.