We all flew the 727s and old thunder guppies with earpieces for years. Nobody wore headsets. It was terrible. LOL. I used to tell guys "If you want me to hear what you're saying, you're gonna have to talk/yell a helluva lot louder that that!" I don't know what else to tell you. You will find no mandate in the FOM other than boom mics below 18K as far as I know. I finally broke down and bought some DCs. LOVE THEM.

Sled