It’s not because of efficiency or whatever you’re trying to say (and saying Kernel literally adds an R), military ranks especially have a long history of crossovers in languages and weirdness in pronunciation and spelling. And all 3 aren’t in line.
Like wow it’s ok to not know these things, but you shouldn’t act all holier than thou. Ciao.
So either 1) you were wrong and now hide, or 2) you’re trolling, weirdly at that. Either way, that means you’re the one that needs to touch grass. Have at it, ciao.