"In May 2003, the Marine Corps was forced to bring a Marine back home after she gave birth on a Navy warship in the Persian Gulf. She told superiors that she did not know she was pregnant."
How do you not know you are pregnant? I would think the weight gain/enlarged stomach, lack of periods, etc. would be clues to at least see a doctor.
I know...I have had a few teens..young maybe 13 who did not know but a woman??