Task: Question Generation
Input (English): Context : The Soviet RPG-22 Netto is a one-shot disposable anti-tank rocket launcher first deployed in 1985, based on the RPG-18 rocket launcher, but firing a larger 72.5 mm fin stabilised projectile. 
Subject : RPG-22 
Relation : service entry
Output (English): In what year did RPG-22 enter service?