A person with no prior military service who is qualified under
section 505 of this title and applicable regulations for enlistment in a regular component of an armed force, or who is qualified under
section 20301 of this title and applicable regulations for enlistment in the Space Force, may (except as provided in subsection (c)) be enlisted as a Reserve for service in the Army Reserve, Navy Reserve, Air Force Reserve, Marine Corps Reserve, or Coast Guard Reserve, or be enlisted as a member of the Space Force, for a term of not less than six years nor more than eight years.