SHEEP DIPPED

The phrase "sheep dipped", is commonly used in intelligence circles. It's a way of saying someone has been given an alternate identity. The best known example being Air America, but also in many other covert ops applications. Not necessarily military. "Those who were accepted got "sheep-dipped" and vanished."

https://www.youtube.com/watch?v=pxb5Rxk3uI4

https://www.youtube.com/watch?v=XFF8Cjj2_xE