(A) Active counter-tracking: the fish-hook. The team leave the track and circle back in the shape of a fish-hook. bergens are left with gate-keepers who guard an escape and evasion corridor (G K). The rest of the team set up a temporary surveillance position overlooking the trail and behind a screen of Claymore mines. If enemy trackers put in an appearance, the mechanical ambush will force the survivors to probe more cautiously; meanwhile, the team change course.

(B) Active counter-tracking: the forward hook. The forward hook is used to avoid danger areas such as villages and track junctions and to by-pass potential ambush sites. The team leave the trail (A) and set up an overwatch position overlooking the danger area (B). If the area is safe, the team circle back to the track and set up another temporary surveillance position behind a mechanical ambush to catch any trackers attempting to pick up the team's trail which was lost at (A).

(C) Active counter-tracking: the `s` shaped hook. The last stratagy developed during the Vietnam War, the double or 'S' shaped hook is designed to sweep both sides of a trail for enemy ambushes before the team set up an overwatch position and their own ambush (A).