[AlexW]

““church keys””
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Even back from my childhood, a “church key” was an opener for a can or bottle of beer. I never heard it used for anything else ;)

[Iron Munro]

Even back from my childhood, a “church key” was an opener for a can or bottle of beer. I never heard it used for anything else

That is my experience also, in and out of the Corps.

4" Church Key Can and Bottle Opener $0.39/Each

"This 4" V-Key can opener is nickel-plated. This standard can opener / punch is used to open small to medium sized cans, as well as remove bottle caps. This item is sometimes referred to as a church key."