From publisher blurb:
The call to be a warrior can reach many different ears. Your country needs you to defend it from menaces internal and alien, but this is a world of magic and mystique. Put aside your notions of simply brandishing a blade or learning how to fire a bow. We need operatives that are just as ecclectic as the forces we face on the battlefield. As a soldier you'll learn to unlock your true potential, developing into the perfect soldier you always wanted to be.
We also go over how to approach running campaigns from the point of view of someone beholden to a nation rather than as a sell-sword adventurer. They can still get into much the same trouble, from a different angle.
A new class, the soldier (10 level prestige class in PF, full 20 level class in 5e), flexible and dynamic. Become a spellcaster, martial adept, or some combination of the two as you perfect your tactics to fight shoulder to shoulder with your allies in the name of your country.