Context: The astronauts did n't get paid extra for being astronauts -- they just got the salary that any other military officer of their rank got . Though space flight was temporary duty , which was paid per diem . The rate at that time was $ 25 per day , which would have been $ 275 for the 11-day mission . But since meals were furnished , that was deducted .

Question: Why would the astronauts not get additional pay ?
Options:
0. They are doing a duty to country .
1. None of the above choices .
2. They are doing a very lazy job .
3. They are doing a very easy job .
Answer: 0