Donna The 173d Airborne Brigade was based out of Dak To during a series of gruesome battles in 1967. The 2nd Bn 503d Infantry in particular was pretty badly chewed up. If your brother was involved in these actions, he would be a good candidate for disability compensation for PTSD, as well as for the physical ailments. These calims do take time to process. However if they are approved, payment will be backdated to the time of application. I would suggest you contact the Disabled American Veterans DAV nearest to you. This organization may be able to help you.