Job security, guarantee pay, food and a place to stay, full benefits, travel, work experience/training that can cost into the hundreds of thousands just counting basic training and AIT. There are plenty of people in the military that couldn't give a damn about going back to school and liSt other incentives, especially when you can land a sweet contractor job or regular job with enough years of experience. My friend just got out after 6 years and got a $60,000 a year job. Just started going to college after he got out. Unless you want to go officer then you have to care about getting your degree.