Military in Your Future?

In Thailand, at the age of 18, all males are registered, but it is voluntary whether they chose to join or not. However, at the age of 21, it is compulsary that all males join the military service. Therefor, when i grow up i am not forced to join the army. I would try to restrain from joining the army at all costs, even if it means to defend your country. But, if i were to join the army, it would be either for training, or if i chose that path in college. I would be able to do the training, but if it means real war, i wouldn't be able to fight. Also, since i want to study medical sciences, and help wounded people, i could help the army in that way. If the army needs doctors, then i would help out. But if the army needs soldiers, i wouldn't want to go there.