My own feeling is that one should refuse to participate in any activity that implements American aggression - thus tax refusal, draft refusal, avoidance of work that can be used by the agencies of militarism and repression, all seem to me essential.
What we do with our lives every day, whether at school, a desk job, or keeping the home in order, is our most basic opportunity to glorify God. That's what your role in His story looks like day in and day out. Instead of waiting to be offered a new role, play the current one well.