A soldier was lightly wounded on Monday when another soldier tried to demonstrate the quality of their new flak jackets.
During the attempt, one soldier stabbed the other with a Leatherman tool, penetrating the vest and wounding him in the abdomen.
The wounded soldier was treated by the 474 Division.
An IDF spokesman responded: "This incident seems to be an exceptional lapse in safety. The matter is being investigated, and will be taken care of as per the findings [of the investigation]."
IDF soldiers face daily threats from stabbing attacks.