Been there, done that more than once. M16s, M1911s, NVGs.
One time for a missing bayonet. The entire battalion back in the field until it was found.
You know, I can see the M-16 and NVG (when they were new), but a M1911.
I carried a P-38 can opener on my dog tags and I thought I was probably deadlier with that than with my M1911.
At Fort Knox, I found part of the pole for the guidon that the guidon bearer lost. Saved the guidon bearer from having to march the route again to find it.