Jaybee_airsoft

Hi, I'm fairly new to Airsoft and I have googled multiple times about Airsoft patches but it isn't very clear. What patches are acceptable to wear for Airsoft? I have seen a couple of people saying don't where something you didn't earn but I'm unclear, for example could I wear a patch that just says 'SAS'? Also if I am in the cadets and I'm a corporal can I wear my rank slide of Airsoft. Thanks, Jack