Task: Question Generation
Input (English): Context : After receiving feedback from users and incorporating the several design changes requested, including adapting the rifle for use with the heavier Belgian SS109 version of the 5.56×45mm round and improving reliability, the weapon system was accepted into service with the British Army in 1985 as the SA80. 
Subject : SA80 
Relation : service entry
Output (English): What was the year that SA80 entered service?