I was in basic shortly before the beret affair. Even then I thought it was a stupid idea. You can have a PC on in less than a second and it's usually on correctly. How long does it take to get the beret on and up to regs?
Well back in the day, it didn't matter as much.
If you were wearing one, there weren't too many others that knew if it wasn't being worn properly and if they did, they wouldn't have the balls to tell you
