My brother was a Marine; he served in WWII and was recalled to active duty during the Korean War. Three of my uncles also served during WWII, and all saw serious action. When I was about 13 or 14, I read a book about the Iwo Jima campaign, and while it brought tears to my eyes, I probably wasn’t crying, but anyway, I knew that I wanted to be around men like that.
Because of my family situation, with a single mother with three kids, I knew that I would serve at least 20 years to retirement even before I enlisted. I was a depression-era kid, and my future looked bleak. Somehow, I always desired to attend college, and if I didn’t serve the 20, I would have the Korean War GI Bill to help me. (Which it didn’t, as I have enumerated under the college questionnaire).