Non-absolute pacifism may be called contingent pacifism. While absolute pacifism admits no exceptions to the rejection of war and violence, contingent pacifism is usually understood as a principled rejection of a particular war. A different version of contingent pacifism can also be understood to hold that pacifism is only an obligation for a particular group of individuals and not for everyone. Contingent pacifism can also be a principled rejection of a particular military system or set of military policies. Contingent pacifists may accept the permissibility or even necessity of war in some circumstances and reject it in others, while absolute pacifists will always and everywhere reject war and violence.