When it comes to this, it doesn't matter what service you join. For approximately the first two weeks of boot camp, you will do nothing but learn how to wear your uniform, iron your uniform, fold your uniform, stow your uniform and, if you're lucky, take out your uniform and iron it again.
How is it even possible to spend so much time on uniforms? Well, given that it's the heart of military life, letting your uniform deviate from the standard by a quantum measurement is basically like punching America in the face. When I was at boot camp, a drill sergeant there would use one of those laser pointers as a level to make sure that medals were mounted on our uniforms straight. It takes time and effort to learn to compete with lasers. We'd also learn stuff like how to repeatedly iron and starch between the buttonholes on our shirts. Apparently, some almost-noticeable lines tend to form there, and the rest of the world doesn't even know about it, but in the military, they could clearly cause a devastating loss of morale.
Look at this guy's ruffled lapels. No wonder he lost the war.
After those weeks, even when you think you're moving on to learning other things, you are still constantly preparing for the most important part: daily uniform inspections. But between those, you do get to learn other things. For example, how to stand at attention, which you wouldn't think would take that long. It's just standing, right? Well, I was failed once because one of my thumbs was resting slightly in front of the crease of my pants instead of behind it. Also rack inspections, where you learn how to make your bed again, and again, and again, and then one more time.