When you complete a mission you gain role charges, not role force. Once you build up enough charges (50 I think?), they convert into a role force, which then triggers the grit passive. So it requires completing a few missions to actually trigger the grit, not every time you complete a single mission.
When you complete a mission you gain role charges, not role force. Once you build up enough charges (50 I think?), they convert into a role force, which then triggers the grit passive. So it requires completing a few missions to actually trigger the grit, not every time you complete a single mission. Under "Raids - Role Force", it clearly states, 'When a mission is completed, gain a Role Force passive."