unit – n. a single thing, person, or group that is a part of something larger
minimum – adj. the lowest number or amount that is possible or allowed - usually singular
recruit – v. to find suitable people and get them to join a company, an organization, the armed forces, etc.
checkpoint – n. a place where people, cars, etc., are searched by someone (such as a police officer) before being allowed to continue
region – n. a part of a country, of the world, etc., that is different or separate from other parts in some way
dynamic – n. the way that two or more people behave with each other because of a particular situation
regime – n. a form of government