Version 6 units were more survivable than Version 4 units during FOT&E II. MRFI provided automatic, passive detection of radar threat locations. MDSA assisted in pinpointing threat emitter locations to enable Version 6 units to find and engage threat radars at a rate 4.5 times higher than Version 4 units. Lacking a similar level of threat awareness, Version 4 units maneuvered cautiously through the objective area, taking care to remain below line-of-sight, but often failing to find and defeat threat radars during the mission.