Is there any sort of a log in your machine to show where and when you stopped? Will your superiors check that?
Is there crimes against time? Can you get in trouble for altering a time line?
Philisophical question. While in your alleged time travels you meet a man an convince him to go somewhere with you, causing him not to meet his future wife. Because of this a certain child is not born, and denied existance. Are you guilty because of this change? You may have known this unborn child in the future. It may have even been your friend.
And if that child would grow up to stop this civil war in the future, and mankind is better for it (no doubt saving several of your friends and family members), would you feel guilty?
Maybe this is a better question. Does what happen here affect your future?