Equine Therapy Army Vietnam veteran Bill Mercurio pets one of the caisson platoon horses from the 3rd U.S. Infantry Regiment, known as The Old Guard, during the Trail to Zero ride at Joint Base Myer-Henderson Hall, Va., Sept. 7, 2019. The event sheds light on the problem of veteran suicide. SHARE: Download: Full Size (1.37 MB) Tags: Veterans, Vietnam, Army Credit: Adam Stump VIRIN: 190907-O-PH007-0006A.JPG Photo Gallery