Battle treatment troopers or BT troopers were a group of clones bred to treat advanced medical wounds. They usually carried an E series bacta tank and sported blue and red armor. These clones usually flew in on a BT Gunship where two or more could have been seen. Also, BT troopers carried advanced shock blasters that could shoot something more than 300 meters away.
These advanced blasters, when shot at Humans, would have paralyzed the whole body for an hour or so, and if shot at a droid, would completely destroy simple battle droids with a single blast. This would give the BT trooper time to load up and fly out.