Combat Medding News Today

Tape is absolutely george zimmerman, sir. >> reporter: john donly, a long time close zimmerman friend and also a former vietnam vet, a combat medding with experience identifying screaming voices. >> you know the men you are with. you know the men that you eat, sleep with, you know who it is going to be before you get there. >> you can tell that from hearing their voice screaming for help and comparing that to what you heard in your everyday life with them? >> yes. >> reporter: when he turned his...