Berserker should have a basic bowie knife for melee combat, and should a have a bow for long range combat. Bow should work a bit like the recurve bow, altough weaker and has no fire arrows. He should wear a black stealthy suit if you havn't modeled/colored him already.
assasin suit from fallout: new vegas

Sorry for page stretch
A syringe gun for healing? I don't like the idea. It removes the notion that a field medic is out there patching up wounded people while fending off soldiers with the rest of the grunts. He should have a (possible futuristic) medic pack/syringe, take the Team Fortress Classic medic as an example.
In my latest sound pack for you I included a medkit using sound I pieced together, but I could also make a syringe using sound as well.