Source: Wu Ming Cheng En The Journey to the West 40th time: "I want to work hard and repay my teacher."
Ruined his family for the national cause. Metaphor is selfless dedication.
Serve the country with your own body. It means that you would rather give your life for national security.
Source: Biography of Xiong Xin: "Qing and others are ready to accept their words and serve the country with their own bodies."