There are three main elements you need to understand in how to prove PTSD to VA:

1. Diagnosis

2. In-service stressors

3. Medical “nexus” or link between your PTSD and the in service stressors.

http://wul.gsf.temporary.site/website_8b3f3a04/va-compensation-for-ptsd-and-other-mental-disorders-hill-ponton-p-a/

http://wul.gsf.temporary.site/website_8b3f3a04/proving-a-non-combat-stressor-in-a-va-ptsd-disability-claim-2/

http://wul.gsf.temporary.site/website_8b3f3a04/dsm-5-criteria-for-ptsd/