Answer: Military
Explanation: To the Ottoman Turks, military power was crucial for the preservation of religion, with some others, of course, because military power was significant in conquering the territory and spreading Islam as a sacred duty. By conquering the territory, the Ottoman authorities would be established, and of course Islam would testify as the "righteous" faith in order to convert the "unbelievers". Everyone had the right to choose, but non-Muslims would pay many extra taxes, which, as Muslims, would not have paid. Such a great empire, such as Ottoman, was supposed to defend and preserve, so soldiers from the people who were subjugated, as a form of taxation, were also recruited, if they were not Muslims.