What each linguist does depends on what unit they are assigned and what its mission is.
In general, be prepared to study whatever language the Army assigns you as long as you are in the Army. That is right. You do not get to choose your language. One is chosen for you. It is your job to be proficient in that language. Love it or hate it. Be prepared to learn your language in 12-15 months. Rosetta Stone will not prepare you for this! Be prepared to stay up all day and night doing linguistic tasks, like studying, reading, listening, and translating your target language. Be prepared to stay up all day and night doing Army tasks, like motor pool, troop movements, inventory, ruck marches, physical training, sergeants' time training, and marksmanship training . Be prepared for no privacy. You will live in the barracks with other people. You will eat, sleep, shower, change, and everything else that you do in front of other people. You will have to take UAs (urinalysis) regularly, while being supervised by at least 1 to 2 of your NCOs. Be prepared to never use your language in your daily job. Be prepared to use your language in your daily job. Be prepared to do whatever your chain of command tells you to do.