Tough Guy, Soldier
He had always been a fighter. On the hard streets of the Bronx even at a very young age he fought the bullies who picked on the less fortunate, like his older brother Jack. His brother had lost the use of his legs at an early age to a bout with polio but, his mind was sharp and quick. Mac always looked up to his brother despite his handicap and because of that he often overlooked minor things that others thought very important, like religion and ethnicity. Being a fighter meant that when he saw an enemy that he thought needed to be put down he itched to get in the fight. So when fourteen year old Mac told his brother that he wanted to fight in the Great War, his brother had a solution.
It was 1917 when he went to war under the guise of his brother, Jack Callahan, and there he learned what it is to be a soldier. He had plenty of great teachers to show him the way however none stood out greater than Lt. Danger. The war was drawing to a close so the tragic loss of his mentor was even more of a blow to the young mans system. He spent his formative years working for the U.S. Army under the name of his brother until a too sharp clerk caused him to be pushed out once the ruse was discovered.
As a soldier for hire he spanned the globe going from conflict to conflict, Jack working the brain end of Callahan Brothers Security. He picked up snippets of language but never really mastered any but English, which has got him in a fair number of pickles and one accidental engagement! Mac has accrued friends the world over but in (Javiers country) during the Banana Wars his ineptitude with mechanic things caused a major issue, one that was resolved by a scrappy kid named Javier. Since then the two are almost inseparable with one or the other getting them in trouble then the other bailing them out.
Mac has settled into a nice job between jobs in good ol’ New York, New York bouncing at a club and living above a garage, waiting for his brother to find their next job.