I suspected it meant Doomsday, when I was little (too much Superfriends on TV). However, I believe it's just military lingo, as the military seems to treat acr

I suspected it meant Doomsday, when I was little (too much Superfriends on TV). However, I believe it's just military lingo, as the military seems to treat acronyms and symbols as an art of functional entertainment. https://www.history.com/news/why-was-it-called-d-day https://www.history.com/news/why-was-it-called-d-day