My friend who's in the Reserves with me recently got arrested for a violation. Should he report this to our chain of command?

Haha, nice.

One thing your friend needs to remember is COs are human too. In their "youth" they also made mistakes and were usually counselled off the record ONCE. But they don't like surprises of this sort, tell him and the 1SG.

Infractions are different than misdemeanors or even (obviously) felonies. If I get physically arrested for anything I am obviously going to notify my CoC (they will likely find out anyway). However, if I get a parking violation outside of military jurisdiction (an infraction or as this poster put it: "less than a misdemeanor"), I am not going to notify my CoC. I am also certain they could care less about such things.

but per the question, he did get arrested. Just like most questions through here, we are not getting the full story. Saying "less than a misdemeanor" but also arrested, I would bet there is more to this than what is presented.

1SG Bill Farmerie - I was wondering the same thing. There had to be some additional details that we don't know about. An infraction and some misdemeanors do not usually result in physical arrest. The usual LEO course of action is to issue a citation and court date and everyone goes on about their business.