oups !
 

Forget the "precious" link http://forum.shrapnelgames.com/image...es/redface.gif

http://www.defence.co.kr/bbs/data/sd...SR_summary.htm

About the detection/identification it's like the sound analyst for a submarine. Some are able to make difference between moving branch and tank antenna, others will probably ask for full scale pounding on a band of sheep.
Just a question of drill and experience.