I still carry the first one I was given back in boot camp, it is marked US SPEAKER. I remember having to sharpen it a couple of times in Vietnam but other than that it remains as issued, although highly polished from over 40 years of being attached to my House Key Ring. The HKR only has the two keys necessary to open my house, the P38, an equally old Proto key ring screwdriver, and an aluminum beer bottle opener from the Winnipeg Hotel, Grand Forks, B.C. I only carry the car key and electonic device attached to it for whatever car I am driving, my wife's car only requires the electronic unit, it is keyless.
I can't tell you the number of times that my small key ring of tools has gotten me or somebody else out of a problem or at the least saved somebody a long walk for tools, I have saved the day on camping trips when folks forget they don't have their electronic can opener with them, fed myself easily, opened hundreds if not thousands of beers for others as well as myself. Adjusted loose mirrors by simply rolling the window down and tightening a screw that came loose.
Thanks for reminding me about how useful those few small tools have been in my life, I've always enjoyed being self reliant. I was visiting my cousins a couple of months ago and I met one of their old friends, now that guy was prepared...he had a leatherman tool and a Swiss Knife Multi-Tool on his belt along with a belt mounted cell phone pouch, I don't remember being impressed. I figure if I ever am forced to carry a cell-phone around with me I might resort to something like that.