He joined The New Mutants ' later incarnation X-Force , serving as second - in - command and field leader .
Cannonball was a founding member of the X-Men's junior team the New Mutants .
He joined The New Mutants ' later X-Men's X-Men's , serving as second - in - command and field leader .
Cannonball was a founding member of the X-Men's junior team the New Mutants .