The term 'Tight-Knit Unit' can be summarized as a small group of people who are closely connected and work together in a unified way. The term is often used to describe a group of people who have a shared purpose or goal, such as a military unit, a team of workers, or a group of friends. The term can also be used to describe a CADRE, which is a small group of people who are specially trained and organized to provide leadership and guidance to a larger group.