Generally, after going to college, you can keep your student status and go to the army. Continue to study after retirement, but you will be demoted. Usually you will be a soldier for two years. However, if you were a soldier in the year of graduation, you can add up your college years to be a soldier. In other words, if you are a soldier for two years and study in university for four years, it is equivalent to six years as a soldier, and you can also pay your tuition for four years in university.