In addition to these records, if you can, get signed testimonies from witnesses about your condition and how it impacted your military career. The most powerful witnesses of this sort are commanding officers. Your commanding officer normally submits a statement at the start of the DoD Disability Process about how your conditions affect your ability to do your job. If you have this, definitely include it. We’ve seen letters from commanders play an important role in Rating Authorities’ decision. Testimonies from other people, like fellow service members and family members, can also be submitted, but are much less powerful.