Science Daily | October 2016 There are nearly 20 million veterans living in the United States today with 14% from the post-911 era (9/2011 or later), 18% from the Gulf War (1990 – 2001), 36% from the Vietnam era, and 17% from earlier conflicts (United States Census Bureau, 2015). In 2009, Secretary Eric Shinseki of the Department of Veterans Affairs …