"Behind the Green Door"

service slang for programs classified above ‘top secret,’ and had nothing to do with any movies or taverns

https://breakingdefense.com/2019/09/the-green-door-mystery-solved-secrecy-slang/

159 Nov 20 2017 2:29:00 AM

167 Nov 20 2017 1:12:14 PM

269 Dec 05 2017 4:01:30 PM