In 2007 I re-enlisted after almost a quarter-century as a civilian. I quickly started learning and re-learning acronyms for everything. My kevlar helmet was an ACH not simply a helmet.
ACH, or helmet
BFR, hazard to tank tracks
If I was asked to do something beyond my capabilities I said NFW: No Fucking Way.
A few months after I joined my high-school sophomore daughter Lisa said in a casual way that Claire was be BFF. I had not heard the civilian version of that acronym, so thinking Army, I assumed she was saying, "Best Fucking Friend." I was kind of surprised that she would use that acronym to describe her friend and said hesitantly, "BFF?"
Lisa said, "Right. BFF. Best Friends Forever." She looked at me, seeing me smile as she spelled out the acronym. "What did you think it meant?" I told her. We laughed.
The year before she went to see the movie "Jarhead" with some of her soccer teammates. When she came home she said, "Dad! You didn't tell me the right words to the Yellow Bird song." I admitted I changed the words.