I found some websites that has been very helpful in seeing if some of these guys are scammers.
The first one is:
This gives you steps to go through to check people out. It is free.
This one you can upload the picture and if they it, it will pop up. It will also pull up other pictures that are similar.
Here is a facebook page that is all about the military scammers.
This one shows pictures used most frequently in scams: