Serving in the military is often compared to being in college. It’s a logical comparison: Most enlisted service members join the military at the same age their friends are heading off to school, and both experiences shape the lives people lead thereafter. Both directions instill lessons and values, and each houses a unique culture that people can either buy into or feel stifled by—or, as is often the case, both.

I joined the Marine Corps a bit later than some. At 21 years old, I had already spent some time gallivanting around Alaska and California, dropped out of a private college in southern Vermont that had given me a scholarship and a handful of awards, worked interior demolition, and slung parts and wrenches for a racing company out of Connecticut. I joined the Marines in a hurry, as I’ve discussed in previous articles, and although I was certain that I had a burning, patriotic desire to serve my country, it was just about the only thing I knew for sure when I stepped on the yellow footprints at Parris Island.

The first time it occurred to me that I might have made a mistake was on the bus from the airport. The first time I was certain that I’d made a mistake was only a few hours later, when one of the guys from my hometown raised his hand during the “moment of truth” to state that he’d enlisted under false pretenses and would like to be sent home. The staff ushered him out of the classroom and I found myself alone in a sea of unfamiliar faces. I didn’t feel like the Marines I’d seen sword-fighting lava monsters in the commercial. I felt like a child that was in over his head.

I’m glad I didn’t take the easy route. I’m proud of my service, of the things I accomplished in uniform, and of the man the Marine Corps made me. But I didn’t know any of that at the time. All I knew was that I’d given up my entire way of life for a new one, but what that new one was remained utterly unclear to me. I recall wondering, one morning as we marched to chow, if the Marine Corps itself was going to be like boot camp. It seems like a stupid thing to worry about in retrospect, but at the time, so deep was my uncertainty that I worried that I’d never again get to sit on a toilet without having another adult man counting down how much time I had left from a few feet away.

I did well at boot camp, as I did throughout my Marine Corps career, in large part because my senses of pride and shame are closely interlinked. There is no mediocre life, as far as my self-worth is concerned; there can only be accomplishment or failure. I could either be proud of who I was, or ashamed of it. There has never been anything in between. So it didn’t matter if I was miserable. It didn’t matter if I missed home. All that mattered was getting what I needed to get done accomplished, and praying I’d emerge on the other side as the sort of man I’d be proud to say I was.

I think many service members struggle with these emotions as they traverse recruit training and the rest of the accession pipeline that imparts in each of us the skills we need to be of value to our units in the fleet. We struggle with self-doubt and with the feeling that we’d left our comfortable lives, and worlds, behind in favor of something we knew now to be void of battlefield romance. We weren’t heroes like we saw on TV. We were kids that got yelled at all day, who felt perpetually anxious and uncertain, and who would occasionally fold under the stresses of training.

As a squad leader throughout recruit training, I tried hard to appear unflappable, but I broke. One morning, I was called up to the quarter deck to be punished alongside one of the recruits in my squad for failing to get back on line in the time allotted. We ran through our push-ups, mountain-climbers, and side straddle hops for however long a punishment usually lasts and were dismissed, but as soon as I got back to place on line, the drill instructor shouted my name again. This time, the punishment was for another recruit in my squad failing to iron his trousers overnight. We did the same punishment exercises as the drill instructor called them out to us, and departed for our spots on line once again.  The drill instructor would proceed to call my name three more times, each with another member of my squad for a violation that they may or may not have committed at some point in the last week, and until that fifth time, I handled my punishment exactly as I was supposed to. That last time, however, during the transition from push-ups to jumping jacks, I started laughing.

I don’t know why I was laughing. Every bit of my body hurt and my mind was racing. Under normal circumstances I think I might have even cried, but somehow the combination of stress and exhaustion manifested itself in hysterical laughter. The drill instructor, as you might expect, took that as a sign to up the ante and started barking orders faster…and I continued to laugh as I pushed, jogged, jumped, and pushed some more.