Prior Service - 1st RSP Experience

I’m a prior service Marine E-5, just joined the National Guard after being out for 10 years. I had my first drill last weekend and I was put in “Red Phase” platoon with a bunch of youngsters first being introduced to the Military. A lot of classroom time learning about rank structure, general orders, etc. I felt like it was a complete waste of my time. But I tried to keep a positive attitude and mentor them… For my prior service guys coming back in…. Did you guys have the same experience? Or were you placed with other prior service folks, or a group more advanced?