Actually from the christians that joined the army.
All Constantine did was make christianity the official religion...................
Wrong because none of Jesus' followers went into the military.
The after-the-first-century so-called followers joined the army.
Constantine made so-callled Christianity (Christendom) the state religion.
It was to him acceptable that the non-Christians could then mix the biblical with the non-bilbical as being biblical.
That is what the churches of Christendom are today: a mixture of Jesus' teachings with non-Jesus teachings.