Interment refers to the burial of a body into the ground or into a tomb as part of the funeral proceedings. Veterans in national cemeteries may be interred in the ground or inurned in a columbarium. Some veterans are reinterred after their original burial for a number of reasons including request of the family and cemetery closure. When service members die in combat, they are often buried close to the battlefield. Once the front shifts, or after the war, the fallen are reinterred so they may rest with their comrades in a national cemetery.
George Collision. Cemetery Interment. Google Books. 1840. Accessed April 08, 2018, https://books.google.com/books?id=CdsDAAAAQAAJ.