Some definitions (thanks Wikipedia) for commonly used terms in Anabaptist circles:
A conscientious objector (CO) is an “individual who has claimed the right to refuse to perform military service” on the grounds of freedom of thought, conscience, and/or religion. In general, conscientious objector status is only considered in the context of military conscription and is not applicable to volunteer military forces.
Pacifism is opposition to war and violence. The word pacifism was coined by the French peace campaigner Émile Arnaud (1864–1921) and adopted by other peace activists at the tenth Universal Peace Congress in Glasgow in 1901.[1
Pacifist: a person who believes that war and violence are unjustifiable.
Peace is an occurrence of harmony characterized by the lack of violence, conflict behaviors and the freedom from fear of violence. Commonly understood as the absence of hostility and retribution, peace also suggests sincere attempts atreconciliation, the existence of healthy or newly healed interpersonal or international relationships, prosperity in matters of social or economic welfare, the establishment of equality, and a working political order that serves the true interests of all.
Nonresistance (or non-resistance) is generally defined as “the practice or principle of not resisting authority, even when it is unjustly exercised”. At its core is discouragement of, even opposition to, physical resistance to an enemy. It is considered as a form of principled nonviolence or pacifism which rejects all physical violence, whether exercised on individual, group, state or international levels. Practitioners of nonresistance may refuse to retaliate against an opponent or offer any form of self-defense. Nonresistance is often associated with particular religious groups.