soon The term "conscientious objector" was given in wartime to those who refused to obey the summons conscripting them into the armed forces, because they did not believe in killing, not even killing in defence.
They were instead directed to other work, like stretcher-bearing for first-aid teams, where they did sterling service helping the injured, often losing their own lives under fire. Some of the alternative work was arduous and dangerous, and they were generally despised by the soldiers and called "conchies"
They would not have killed for a different army, because it had nothing to do with the ideals of their own country.
A pacifist believes in peace and works for it.