R and R

A Stranger is Watchingを読んでいます。
They'd been married right after graduation. Then he'd gone into service, been commissioned and sent to Viet Nam. They didn't see each other for two years. Finally he'd got an R and R and she'd met him in Hawai. She'd been so beautiful, running down the steps of the plane, tumbling into his arms.
"R and R" は何の略でしょうか？
・Wiktionary: Rest and recreation, or rest and relaxation; especially as a respite from military combat
・Dave's ESL Cafe: R and R: rest and relaxation (a vacation).: "I think you're working too hard, Dave. You need some R and R."