The term 'ARMY EATERY' can be broken down into two words: 'MESS' and 'ARMY'. The term 'MESS' is a four-letter word which refers to a communal eating place, especially one provided for members of the armed forces. An ARMY MESS is a place where soldiers can come together to eat meals and socialize. It is usually run by the military and provides a variety of food options for its members. The term 'ARMY' refers to a large organized force of soldiers, typically equipped with weapons and equipment. Together, the two words form the term 'ARMY EATERY', which is a place where members of the military can come together to eat and socialize.