Task: Question Generation
Input (English): Context : The AAI RQ-2 Pioneer is an unmanned aerial vehicle (UAV) that had been utilized by the United States Navy, Marine Corps, and Army, and deployed at sea and on land from 1986 until 2007. 
Subject : AAI RQ-2 Pioneer 
Relation : service entry
Output (English): What year did AAI RQ-2 Pioneer come into use?