nal Defense Authorization Act for Fiscal Year 2007 (Public Law 109???364; 120 Stat. 2294) [10 U.S.C. 1074 note] and other studies of the Department of Defense and the Department of Veterans Affairs that address the connection between exposure to combat and the development of Alzheimer???s disease, Parkinson???s disease, and other neurodegenerative disorders, as well as epilepsy.