I'm historically Mennonite; we believe in non-resistance so no war. When we went to the Crimea, Catherine the Great gave us an exemption on military duty. Forestry (forstei) service was the option. In the Great War, some of us decided to be medics. It was very controversial. Even worse, when the revolution happened, the Russian Reds attacked the villages, and after 500 years of not fighting, the Mennonites formed self defence (selbstschutzen) units and fought back! Very interesting history.
My people settled in Southern Ontario in the 1920s, leaving the Soviet Union following Stalin's Harvest of Sorrow, which devastated the Ukraine, and killed over 6 million people. Many Mennonites did settle in Southern Manitoba though.