Martin defied the stereotypes of his day and the assumption by Christians that the military was (or is) inherently no good.
Not everyone knows that Francis was a survivor of a horrific war, one of only nine left on the battlefield after a crusade
Ignatius grew up desiring a life of glory, which for millennia was thought to be gained almost exclusively on the battlefield.
After the war, an imperial decree provided amnesty for deserters like John, so he became a priest
For Christians in high places, theirs was a closeted faith, known only to others like themselves.