What is the fine-grained topic of the following text: Effectively ruling out U.S. cruise missile attacks and other options that wouldn't require U.S. troops on the ground, Dempsey said the military is clearly capable of taking out Syrian President Bashar Assad's air force and shifting the balance of the Arab country's 2 1/2-year war back toward the armed opposition. Only return the topic.
U.S. military capabilities regarding the Syrian civil war