When serving in the armed forces, the military men and women serving alongside you are more than your friends. Each person is responsible for keeping each other safe and for fighting towards the same goal. For this reason, men and women in the armed forces tend to get closer and feel more like a family rather than just friends. When returning to civilian life, many people lose track of those they once spoke to every day in the service. Thankfully, it's never been easier to reconnect with lost comrades.
There are many different ways to look for a lost military service member, but the internet is a huge asset. There are many sites to help you look for fellow veterans such as military.com's buddy finder, the National Archive's Veteran Service records, and sites specifically designed for certain wars. The trick to finding someone is to gather as much information about them as possible before looking. It will help narrow your search and help keep you focused.
What other advice do you have?