...a military function that supports the commander’s mission by establishing and maintaining coordination and co-operation between the military force and civil actors in the commander’s area of operations.
You must:
Be ranked Sergeant or higher
Have your CO's recommendation
Commit to deploy on operations
Successfully complete selection
Qualities
You are a soldier first.
You likely have specialized civilian skills that can enhance your contribution to the Forces.
You can talk with anybody, negotiate and resolve conflicts.