When you've got nothing but time on your hands, it's hard not to get into a discussion with a fellow Marine. And, with all the possible topics of what Marines talk about, you'll inevitably stumble across something you disagree on.
These are among the most popular debates Marine might be embroiled in.
1. Wearing an undershirt beneath your blouse
This one usually spawns after a higher up gives a lower enlisted an ass-chewing. If you're stationed somewhere hot (say, Hawaii or Guam), the additional airflow from not wearing an undershirt can help make the day-to-day less miserable.
However, there are lower enlisted who believe in wearing an undershirt and they will debate you on this topic.
2. Rank versus billet
A billet in the Marine Corps is your specific position within your occupational specialty. According to doctrine, certain billets require certain rank, but since it might be more difficult for some to get the required rank, many will have the experience needed without having the position.
This becomes a debate when someone of higher rank with low experience (say, a Corporal fresh out of 8th and I) comes to the unit and they're automatically thrown into a billet, like squad leader or team leader, when they know nothing about that position — since they just spent the last three years being set pieces at the White House.
3. Foliage on helmets
When you're in a jungle, adding some of the local flora to your gear might complement your camouflage, but a problem invariable arises when a lance corporal takes a twig and sticks it in their helmet to be ridiculous. This, of course, ruins it for everyone else.
4. Favorite adult film star
Everyone's got their preference and to each their own, but if you exclaim the name of a favorite, someone is bound to debate you on why their pick is better. They'll go into insane detail, bringing up every film they've ever done and give you a complete breakdown of that star's career as if they studied them in film school.
5. Peanut butter versus jalapeno cheese spread
Some like brown glue that tastes like a childhood favorite while others will argue passionately about why they prefer the yellow dog poop with jalapeno flavor more. They'll also be sure to tell you why you're wrong for enjoying the other. Either way, they both come in MREs and should be avoided if at all possible.