USMC/Combat Helicopter Association (www.popasmoke.com) – They were there and then they weren’t – Learning Under Fire – Viet Nam HelosNaval Aviation MuseumMarine Corps Heritage Foundation USMC/Combat Helicopter AssociationUSMC/Combat Helicopter AssociationNavy Yawl History At Patuxent Navy Sailing ClubHERO FOUND: The Greatest POW Escape of the Vietnam War