Go through obsticles
Hit crouch then get up near a wall or rock.
Note#1:the best level to do this is the level with all the trains that are wrecked.
Note#2:If it doesn't work try again.
Note3:one time I did this and I was technicly flying...but I was easier to kill.
More tricks, tips and cheats for this game are right here - Tom Clancy's Ghost Recon cheats
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