A Colonel is a high-ranking Army Officer, typically in charge of a regiment or brigade. They are usually the highest ranking officer in a unit and have seven letters in their title. A MAJOR is a mid-level Army Officer, typically in charge of a battalion or squadron. They are usually the second highest ranking officer in a unit and have five letters in their title. A GENERAL is a senior Army Officer, typically in charge of a division or corps. They are usually the highest ranking officer in a unit and have seven letters in their title.