Aliens or military?
I just heard the quietest helicopter fly overhead. It sounded quiet like old steam engines. There wasn't a long drawn out approach or fade into the distance like the typical hospital flight care copters that fly over either. I can't find anything comparable on YouTube. Any of you military buffs got some audio of quiet helicopters or do they not exist?
Last edited by vr; August 15th, 2013 at 12:19 AM.