A drawing of three stars of the same design was also pinned to the Mosaic Investigation wall in Mark's flashforward. While starting his recreation of the wall, as a part of the Mosaic Investigation, Mark recreated the drawing.
The stars have also been seen at the airport in the scene where Demetri meets his girlfriend, as seen in the image on the right. ("137 Sekunden")
It was revealed by the producers in a video segment that the tattoo was inspired by a tattoo actress Christine Woods (Agent Janis Hawk) has on her right arm. Her tattoo is a set of three side-by-side circles. 
The stars are of a similar shape to that of the US Army's Bronze Star.