This article shows that all wars are the result of man's sinful nature; however, war is not outside God's power. God uses war to judge one nation against another. They also remind us of the horrors of sin, and the fact that peace is dependent upon God.
This article shows that war or fighting is allowed if it for self-defence and defending others. Therefore, Christians, on the grounds of seeking God’s justice, can participate in the army and police service.