I decided to do a little bit of research. Up until 1933 the War Department maintained that cemetery after which responsibility was transferred to the National

I decided to do a little bit of research. Up until 1933 the War Department maintained that cemetery after which responsibility was transferred to the National Park Service. It looks like NPS was the ones that decided to cut the headstones based on the dates. The real sad thing about this is that those are only the positively identified remains. There are twice as many unmarked graves. And a nearby Confederate cemetery has 30,000 buried and only 2,000 identified. https://www.nps.gov/pete/learn/historyculture/poplar-grove-national-cemetery.htm https://www.nps.gov/pete/learn/historyculture/poplar-grove-n...