 FACT: Site Y appears to be staffed by units of US Army Special  Forces. The patch worn on the Green Beret is known as a flash, which  is in the shape of a shield, and identifies the individual Special  Forces Group. It is mistakenly worn upside down in the film. All  Special Forces officers in the movie are wearing the Special Forces  Crest on their flashes. Only enlisted personnel wear the crest on  the flash, officers wear their rank.