This document discusses traumatic brain injury (TBI) in veterans and active duty soldiers. It notes that TBI is the "signature wound" of recent wars. Mild TBI is difficult to identify but can still cause long-term symptoms. Soldiers are at risk of TBI from blast injuries from IEDs and other explosions. TBI often occurs with other injuries and can cause physical, cognitive, and behavioral issues. However, the long-term symptoms reported by many soldiers may be due to multiple factors beyond just the TBI, such as PTSD, depression, and the ongoing traumatic environment of combat. Early identification and treatment as well as education about recovery can help facilitate reintegration.