U.S. Army P-51 CAN OPENER Summary
It was designed in the 1980s as the big brother to open #10 cans and the large 36 soldier meal pack or T-Packs.
At 2" long, the P-51 is much easier to use than the older, smaller version. Key ring attachment hole, folds flat for carrying.
In an emergency the P-51 can open crates and boxes or tighten scope ring mount screws, but the greatest utility is having a can opener available at all times for emergency use.
US Govt. #P-51-2-1503.