I joined that army back in 2010 and at the time I was 18 and had a normal period. In fact I had my period the week before I left. But right after we got all out shots my body went all wonky and I didn't have a period for 6 months. When it came back it was all over the place. Sometimes lasted 2 weeks. And then would vanish for months. It's been 5 years and my period is fairly regular again but after some tests I found out I had mysteriously become sterile. So now I'm 23 and can never have kids. I don't mind as I don't want kids.