Is Bretheren like Mennonite?
I believe (and I may be wrong here) that they are from the same Anabaptist roots, but the Bretheren have a strong emphasis on social justice and missions whereas Mennonites are focused on modesty and personal holiness. Both denominations are pacifist.
We left the Bretheren church when I was a boy because my dad-who was active duty Army at the time-couldn't stomach the anti-military slant of the church.