In the Bible Jesus encounters Roman soldiers but does not tell them to 'quit their day job'. Jesus encountered a centurion with 'great faith' as recorded in Matthew 8. Peter as well baptized a centurion, named Cornelius. A centurion was a higher ranking soldier over a hundred strong experienced Roman army men underneath him. (One can only imagine what a man like that would have had to go through to be honored with such a rank especially in the brutal history of Rome). After preaching and praying the Holy Spirit 'fell upon' those they were gathered among Peter and Cornelius and Peter exclaimed in surprise and excitement;
“Surely no one can stand in the way of their being baptized with water. They have received the Holy Spirit just as we have.” So he ordered that they be baptized in the name of Jesus Christ. (NIV Acts 10:47-48).
Here we find Peter not only 'accepting the soldier', but calling for an 'immediate baptism' -- both against the 'Apostolic Tradition' handed down from Peter?!
Understandably, when Christians were on the ‘hit list’, a Christian soldier, faced with having to kill a Christian, would have had to switch sides and become a martyr. In these same conditions, I assume that serving in the Roman army almost became synonymous with the ‘anti-Christian’ beast of Rome, so in the Apostolic Tradition, I can partly accept the rejection of soldiers from the church (actually rejection of soldiers, actors and others):
If someone is an actor or does shows in the theater, either he shall cease or he shall be rejected. ... 11The catechumen or faithful who wants to become a soldier is to be rejected, for he has despised God. (Hippolytus, The Apostolic Tradition)
What I am wondering was, 'Is there any indication in this tradition by Hippolytus of Rome that the Church in Rome was supposed to have kept this Apostolic Tradition, or was this just a temporary measure of the church in Rome at that time?