I like to use the decoys just before hitting the thermal layer and then flank ahead to 300 ft, once there i can go to ahead 1/3 and sneak out of the area. If i'm still deploying to my mission area i'll just leave unless there is a really nice target nearby. The decoys in SH4 seem to work quite well, But i am not sure if using decoys more than once per engagement is useful or not.
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