salute properly? (credit to Trump, this is something he actually knows how to do, unlike a lot of actors I've seen portraying officers
He really doesn't. He swings his arm around improperly, and puts his hand in the wrong place, and at the wrong angle. I'll grant that his "salutes" aren't as awful as some actors' are but they're definitely not good.
Saluting correctly is actually quite simple. If you're not wearing a hat, your middle finger should come to the right end of your right eyebrow. Your hand should be perfectly flat, with your thumb tight against your hand and in the same plane, which should be angled about 45 degrees to the ground, palm towards your face. If you are wearing a had, it's the same except your middle finger should be at the forward right corner of your hat brim.
How your hand should get to that position is very simple: a straight line. Generally your hand starts from a position alongside your right thigh and it should track the straightest possible line from that position to the final position, with no extraneous movement, no unnecessary elbow or shoulder movement. For example, no throwing your elbow out and then swinging your forearm up, or swinging your hand out in a big circle or anything else likely to smack the guy next to you in the ranks. Note that fancy drill presentations do alter this for effect, but that's only certain sorts of ceremonies. Outside of those, a smooth, straight, crisp line from starting position to ending position is how the US military salutes. (Officers are generally not as good at this as enlisted.)
Ending the salute is the same. A straight line from the salute position to wherever the hand is going to go, generally to a position along the seam on the outside of the right thigh. Along the way the hand transitions from the flat plane to the "holding a roll of quarters" configuration with the thumb on top and parallel to the pant seam.
But most importantly, how will they learn what their obligations and constraints are under the Uniform Code of Military Justice? When you join the military, you waive some rights, as established by the UCMJ and related laws. A lot of "tech bro" behavior would probably be court-martial offenses.
Indeed. The UCMJ is considerably less gentle than the civilian judicial system, and deliberately sets aside many constitutional rights. I would find it hilarious if some of them got court-martialed for things they didn't even realize were crimes. I'm not so concerned about how they learn about the UCMJ and its implications for them. They chose to accept commissions, they spoke the oath. If they don't bother to learn what that means, that's their problem. Ignorance of the law is no defense, and this is at least as true under the UCMJ as the civilian system.
But I want them to go through "Winter Ranger"
Sorry, that's just petty, and irrelevant.