Bùduì de chuīshìyuán měitiān língchén sìdiǎn jiù qǐchuáng.
The army cooks get up at four in the morning every day.
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炊事员 is the institutional term, used in the military, schools, work-unit canteens. A restaurant chef is 厨师. 炊 literally means to cook by fire/steam, an old character that survives mostly in this compound.