Equine Admirers Attendees of an Army performance at Joint Base Myer-Henderson Hall, Va., pet one of the horses assigned to the Caisson Platoon of the 3rd U.S. Infantry Regiment, known as “The Old Guard,” May 8, 2019. SHARE IMAGE: Download Image: Full Size (2.91 MB) Tags: Army Photo By: Army Cpl. Lane Hiser VIRIN: 190509-A-EI292-0047Y.JPG Photo Gallery