For over 30 years, retired Gen. Charles Krulak observed Marines. First within the ranks, and then as the commandant of the Marine Corps for four years.
He retired in 1999, but on Tuesday, he revealed something he learned during his time in the military: that Marines fought for one thing.
No, it wasn't the American flag.
It wasn't the United States, either, and not even the Marine Corps made the top of the list.
“You fought so that you would not let down the person on your right or your left,” he said in a video posted to Twitter. “That's why Marines fight. At the end of the day, it's, 'I'm not gonna let that person down on my right or my left.'”
Krulak explained that in wartime, you end up “in love with those people” who are around you, and the desire to not let them down is a “powerful motivator.”
“The thing that keeps you going is you're not gonna let your fellow Marine down,” he revealed.