Concept of war and the Christian

This article was written by an apologist on the topic of Christians and war.
She addresses the past crusades and the different struggles throughout history in relation to the idea of a Christian serving as a soldier. We’re called to love, and be a people of peace. Yet there is time for war.
So as modern day Christians, should we be joining the military? Learning to kill, defend and serve? Should we be enlisting to defend the land the Lord has given us? And the rights we say we all have simply in being?