The Electronic Systems Division 806L "Range Threat" systems for electronic warfare simulation were developed for use by 1CEVG late in the Cold War. Such systems included the US Dynamics AN/MST-T1 Miniature-Multiple Threat Emitter Simulator (MUTES), for which the group evaluated the prototype in 1977 (operational in October 1978). Similarly, TLQ-11 jammer improvements were in 1978, and in 1979 1CEVG members completed a prototype study and testing of the new Threat Reaction Analysis Indicator System (TRAINS) for analyzing how aircrews and avionics reacted to ground-based threats.