What is the definition of Usmc1?

"Usmc1 is like the secret sauce of the nuclear submarine world, a highly classified cocktail of hydrogen and oxygen that, when mixed just right, makes submarines sound like they're auditioning for a bad sitcom. But here's a twist - imagine if this 'usmc1' was a viral TikTok dance move, and every submarine crew member started doing it in the middle of a nuclear crisis. It'd be like the world's first synchronized panic dance-off!"