May 25, 2015 10:40 am WATCH: Old Guard Posts Arlington Flags Members of the 3rd U.S. Infantry, known as the Old Guard, describe placing hundreds of thousands of flags on graves in Arlington National Cemetery ahead of Memorial Day. US & World Videos 0:54 Nude cruise sailing out of Miami in 2025 1:36 Arizona Senate repeals 1864 abortion ban 1:40 Democrats say Big Oil misled public for decades about climate change 1:01 Woman arrested on human trafficking and prostitution charges in Miami-Dade in court 1:45 NYPD enters Columbia University in riot gear to clear protest