Photo credit: U.S. Air Force photo by Tech. Sgt. Jeremy T. Lock
Your total service obligation will be eight years (of which the first four years are Active Duty). At the completion of the first four years, you may elect to continue on Active Duty or enter the Army Reserves for the remaining four years.
Your total service obligation will also be eight years, but the Active Duty commitment is only three years. At the completion of the first three years, you may elect to continue on Active Duty or enter the Army Reserves for the remaining five years.