My Naval Advisory Group black beret. Some of you may notice that the Naval Advisory flash patch's RVN flag is the reverse direction of the 5th Special Forces flash, with a gold border. The regulation we received stated the patch was to be on the right side and centered. I guess that was so we wouldn't be confused for The Duke. Actually, the reason I remember the memo so well was that I had to have the flash on my beret put on the correct side. It was originally on the left.