The link has information about the use of military designs. You might be unable to find what you are looking for because no one has received the rights to digitize any military designs or words associated with the military.
There is a question in the back of my mind whether it would be legal to digitize these official ribbons and bars. Opinions, anyone?
Just another thought - you could add the text Sharpshooter below a design that is Marine oriented and not copy protected. Dakota has a really nice set of military designs across the different groups of military and I'm sure they got permission for whatever they digitized, as they have been providing commercial designs for decades and are very careful about copyright.