What is the ruling on working for Canadian combat and aerial assault programs if they will be used against Muslims?

The fundamental principle regarding aiding sinners in their disobedience is prohibition, while the fundamental principle regarding working for non-believers is permissibility. Working on developing programs that might be used to kill Muslims, or might not be, requires a comparison of benefits and harms. If the abstention of Muslim students from this work does not hinder its progress, and if the engagement of students in it benefits them and provides them with technological expertise that people of good might benefit from, then the realized benefit outweighs the potential harm. However, if the supervisors are stingy in allowing Muslim students to benefit from technological expertise, and the laboratory benefits from them without benefiting them in return, then it is imperative to abstain from working there.