Task: Question Generation
Input (English): Context : The BMP-3 is designed and produced by the Kurganmashzavod (``Kurgan Machine Building Plant'') some variants however are built by the Rubtsovsk Machine Building Plant (RMZ), for example the BRM-3K. 
Subject : BMP-3 
Relation : service entry
Output (English): What year was BMP-3 introduced?