Tracer Dart Gun

Battlefield: Bad Company
In Bad Company, the Tracer Dart Gun makes its first appearance in multiplayer, issued to the Specialist kit. It is meant to be fired on vehicles to have a permanent sight of said vehicle and it allows rocket launchers to lock on. The shot travels slowly, so it can be difficult to hit farther targets.

The player who place a tracer dart will get small bonuses for every time a rocket hits a traced vehicle.

Battlefield: Bad Company 2
The Tracer Dart Gun returns in Bad Company 2, only being slightly different in appearance and it can be used by any class, occupying the sidearm slot.

RPG-7 are no longer affected by tracer darts (they do not lock on).