In order for a year to count towards the 20 year retirement a Soldier must earn 50 points during their "Retirement Year".
It is DoD policy that every person who enters military service by enlistment or appointment incurs a Military Service Obligation (MSO) of 8 years from that entry date, in accordance with section 651 of Title 10, United States Code. There are a few exceptions to this policy.
Currently any enlisted member of the National Guard must receive a conditional release from the National Guard and process through a Recruiter in order to enlist in the Army Reserve.
Depending on the policy of the individual state of some Army National Guard officers may transfer directly to the Army Reserve?