The Presidio National Cemetery’s earliest known burial is 1854. The Cemetery closed in 1973 to internments. As a result you can see grave markers from those who fought in the Civil War, Spanish American War, WWI, WWII, Korean and Vietnam wars. The early markers are varied and seemed to depend on the wishes and financial position of the families. The newer markers are what I consider the more traditional as seen in this picture. There is a road that leads into the cemetery and as you walk up you see an oval with the road splitting to the left and right of the oval. Within the oval are buried the officers. Outside the oval are buried the enlisted. This is not the same in the new sections with enlisted lying next to officers.
For more information, here is a link to the cemetery http://www.nps.gov/prsf/historyculture/san-francisco-national-cemetery.htm