My friend Tom Light was a stickler for the distinctions between Memorial Day, honoring those who died while on active service, Armed Forces Day, those, including reserves, on active duty and Veteran’s Day, those who have served in America’s military service. Today we honor those to whom we owe a huge debt, those men and women who sacrificed their lives in the cause of freedom.

The nation’s military cemeteries are places to reflect on that sacrifice. These photos are from the Camp Nelson National Cemetery that is adjacent to one of the newest of the National Park Services units, Camp Nelson National Monument in Kentucky. The camp was a supply base for Union armies, a training center for African American soldiers and a place where thousands of horses and mules were rehabilitated and returned to service.