I've still got a couple P-38's around, used to always have one between my dog tags rubber banded together.
Now I carry a Swiss Army knife, Saw, scissors, magnifying glass, punch/reamer,2 flat tip &1 phillips screw driver, can and bottle openers, cork screw, 2 blades, and a couple things I don't know what the hell they're for.
Never had any use for them till I got one in the early 90's . I took it to work and after I used the magnifier and tweezers on metal slivers, and cut banding with the scissors I decided it was a pretty good tool . I'm still carrying the same one as a key fob 20 years later.