Focus on her merit, not socio-political agenda.
Marine gone art teacher sounds interesting to me, however, Marine can mean several things – was she an infantry trooper on the front line? An office clerk on a base? What was her specific expertise?

As an Ex military myself, I find it surprising how broad a scope the term ‘soldier’ covers for most people.

Use her expertise as a key into her being recruited to work for this off-grid agency. Lastly, best to give her a long-term goal for the series as a whole, which means what is it she wants to achieve by the end of season one.

For example:
After witnessing a student’s murder, a marine sniper gone art teacher must join an off grid agency to prevent a terror cell from targeting students around the country.