Anyone mind filling me in on these ribbons?

I was going through some of my stored items recently and found one of my grandfather's ribbon racks, I was hoping someone would fill me in on what some of them mean. He retired Sergeant Major, and from what I remember he was in Vietnam and Korea, maybe some of WW2, though he passed when I was pretty young, and my mom isn't much help. I've tried looking some of them up years back but it's not an easy process.