The answer
It seems that St. Dionysius of Alexandria (third century) rejected service in the Roman army, or at least to fighting others, saying, “Love is altogether and for ever on the alert, and casts about to do some good even to one who is unwilling to receive it.”959
Fr. Tadros Yacoub Malaty
Notes
959 St. Dionysius of Alexandria, Epistles 14 (ANF 6:110).