What’s a CO?
Conscientious objector.
[who has] claimed the right to refuse to perform military service” on the grounds of freedom of thought, conscience, or religion.
Mind you, being a CO doesn’t get you off the hook. You may be required to perform civilian service instead of miliatry service. In addition, you can’t just claim to be a CO — as you can imagine, it’s a tough sell to a draft board in time of war.
http://en.wikipedia.org/wiki/Conscientious_objector#United_States
The Wolf