If someone is in the military and they kill for their country beliefs and family are they breaking the commandments and will they go to Hell?

Well one can't say that just because it is their job to kill something, it is moral. There are many people who make a living as mercenaries and thieves for hire. This is their job, but to most of society, their actions would be considered immoral. Also, it is illogical to say that just because others are doing something, you have the permission to do the same thing without consequence.

This topic in general is very highly debated among different religious sects. I am Christian Catholic and can only give you the Catholic answer to this question. The way the Church looks at it, if a man kills someone in order to defend his country's beliefs, and the beliefs of that country are parallel to the needs of a more peaceful, just, and loving mankind, then that man's actions are not sinful.

Whether or not a person's final destination is Hell is determined by God alone based on our sins compared to how we have learned and changed ourselves based on these mistakes. However, hypothetically, if a man's only questionable action was this form or killing and the previously mentioned circumstances hold true, based on the Catholic Church's teachings, the man would not go to hell.