R 'n r

[Mark Zuckerberg]

An abbreviation used by the [US Army] meaning Rest and Recreation, Rest and Recuperation or Rest and Relaxation. Frequently referred to by troops as I ‘n I (Intoxication and Intercourse), it refers to the practice of rotating combat troops out of the [front line] to give them an opportunity to relax and [unwind] thereby reducing the impact of ptsd. The term was certainly used during the Korean and Vietnam Wars but most likely dates from World War II.