What are some good military schools you would suggest for a young NCO or E5 in the Army?

Any school you can get is good

1. Skill schools; Ranger, Sapper, Airborne, Air Assault, EOCA, etc. (if any of it applies to your MOS)
2. ALC... Get ahead if opportunity comes
3. Battle Staff NCO - opens a lot of positions for you

Master Fitness Trainer Course was fantastic, and worth quite a few hours. It can also add an additional duty if you don't have any. UPL, Environmental Compliance, Ammo Handler and Range Safety Officer if you can get it.