Was issued one in the Corp in '81 along with my C-Rats. Eventually we switched to MRE's. I have a couple in my canteen cover pouches, and with my dog tags. Used them daily for a long time. Just as fast as a civilian manual can opener. Buddy and I were making Dutch Oven Cobbler for Scouts one night and raced each other to see who could open three cans of fruit first. Cobbler was delicious.