We use to get the TL-28's and TL-29's by the box full back in the 1970's and 1980's. I was an Aircraft Electrician in the Marine Corps back then and we all carried one or the other on our belts all the time. One the TL-29's, we would file off the knife blade on the screwdriver blade. Not good to slip and have your thumb slide down the knife protion of the screwdriver blade. So as soon as the knife was out of the plastic bag that it came in, out came a file and the blade was filed off. I still have a couple of each in my tool box in my gun room.

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USMC 69-93 Combat Pistol Inst.