For Tier 1, you will be asked to participate in a online survey that can be completed in your own time. You will be asked to do this twice over the course of the five year study period.

For Tier 2, the in person assessments, civilians will be invited to travel to either Indiana University school of Medicine in Indianapolis, Indiana, or Medical College of Wisconsin in Milwaukee, Wisconsin. Military personnel will be asked to travel to one of the Intrepid Spirit centers: Ft. Hood, Ft. Bragg, Joint Base Lewis McChord, or NICoE. For these in-person study days, you will complete a similar series of questions to Tier 1, provide a urine sample (if applicable), blood draw, and MRI. This would take place in one day and you would only be asked to do this once in the 5 year study period.

Military personnel at the Naval Explosive Ordinance Disposal school at Eglin Air Force Base will be invited to participate in a one-time study including a few neuropsychological measures, a similar series of questions to Tier 1, and a blood draw. This would take place in one day and you would only be asked to do this once in the 5 year study period.