Pages from my pocket calendar. X's marked off the daily measured progress toward my DEROS (date eligible for return from overseas) many months in the future. Grunts with just a few weeks left in-country were "short."

CA means "combat assault" or riding the Hueys to a mission or new location. Using the military phonetic alphabet, this would be called a "charlie alpha."

Learn about the military phonetic alphabet here:
https://www.dropbox.com/s/qjdz5e3973bapbu/military%20phonetic%20alphabet.pdf?dl=0