Syringe

A syringe is a simple piston pump consisting of a plunger that fits tightly in a tube. It is used for many medical procedures that consist of injections, and is usually used with a needle.

Battlefield: Bad Company 2: Vietnam
In Battlefield: Bad Company 2: Vietnam, the Syringe is a gadget issued to the Medic kit. It seems to be the equivalent to the Defibrillator for the base game, just like the Defibrillator it can be used to kill enemies.