I was visited by my wife at the last week of March, till the end of the first week of April in 2010. I left April 14th for Basic training, 4 weeks into training I find out that she's pregnant. Now I have done the math a few times and it just doesn't seem to add up right. My son was Born 12/06/10. Can someone please tell me if they think this is right or not?

Math adds up pretty close to me. Depends on her fertile period but 8+ months is not unusual. Have a DNA test if you are concerned.

Normal term is 9 months from the day of the missed period which can be up to a month before that occurs which is why full term is 40 weeks or 10 months.

Why guess? Ask for DNA testing.

Do you have reason to suspect the child is not yours? As was said, a DNA test will let you know for certain, but the dates do work out to it being a good possibility that the child is yours.
You have several weeks at the end of a pregnancy that would be considered a normal time frame to give birth in. Do you recall the due date she was given?

If you are having doubts about if this child is yours or not get a DNA test for goodness sake.