I was almost 25 years old and had spent 21 months in the US Navy on a 2 year enlistment contract, receiving an early out to return to college. I had joined the Navy after taking a leave of absence from college after 2 and 1/2 years and while my grades were right around a "D+" to "C-" range, I just did not want to pursue a college education. I don't know if it was because my parents had forced me to go to college or because I had not learned enough in high school, but I was not interested in anything college had to offer me.
However, after spending a year working before entering the Navy and almost 2 years in the Navy, I quickly realized that college offered me what I needed whether I liked it or not... When I graduated in 1974, four years behind schedule, my grade point average in my major was 3.8 which I thought was pretty damn good, given my previous grades.
Interestingly, looking back on my 45 year career, none of my employers (which included colleges and universities) never once asked to see my grades either before or after being employed.