THE EE WAS REPAIRING A POWER RAM THAT WAS JAMMED IN THE EXTENDED POSITION. HE TAPPED THE END WITH A HAMMER AND THE PISTON RETRACTED PINCHING HIS LEFT THUMB. A PIECE OF TISSUE WAS AVULSED FROM THE PALMER SIDE OF THE THUMB. THE WOUND WAS DEBRIDED AND CAUTERIZED AT THE EMERGENCY ROOM.