Does your loved one come home and speak in a language you can't understand? Are you able to decipher the code? The military has a long history of using acronyms and abbreviations. Perhaps when they had to say "Estimated Time of Departure" so many times, it eventually just turned easier to say "ETD".
There are SO many different acronyms and abbreviations. We have complied a big list and you can find it in Naval Services FamilyLine's publication, "Sea Legs: A Handbook for Navy Life and Service". Available for download today!