On June 27, 1899, Crown Hill's board passed a resolution that allowed members of Grand Army of the Republic posts in Indianapolis who served in the U.S. army or navy to be buried in Section 9, adjacent to the National Cemetery. The body of Brigadier General Edward Richard Sprigg Canby rests in a place of honor in Section 9, Lot 1. Other notable Civil War veterans buried within view of the Union dead in the National Cemetery include Union General Jefferson C. Davis, buried in Section 29, Lot 1, and Brigadier General Abel Streight, buried in Section 29, Lot 72. On October 27, 1969, Major Robert W. Hayes of the 774th Tactical Airlift, was killed when his plane exploded over Chu Lai, in what was then South Vietnam. He is interred in Section 10, the final burial in Crown Hill's National Cemetery. As of December 31, 1998, the National Cemetery includes 795 burial sites. Crown Hill Cemetery, including the National Cemetery, was listed on the National Register of Historic Places on February 28, 1973. The National Cemetery portion, which is listed separately, was added to the National Register on April 29, 1999. In addition to the Union soldiers who are buried in the National Cemetery, Crown Hill is also a burial site for Confederate prisoners of war who died at Camp Morton, a large camp located north of Indianapolis. In 1931 industrial development around Greenlawn Cemetery required the bodies of the Confederate prisoners to be moved to Crown Hill, where they were interred in a mass grave, known as Confederate Mound in Section 32 at Crown Hill. In 1993 a Confederate Memorial, with ten bronze plaques listing the names of the 1616 Confederate soldiers and sailors who died at Camp Morton, was erected to mark the grave. There are many artworks on the property, some of which are freestanding, but most are associated with gravesites. The National Cemetery contains a few memorials in addition to the individually marked graves. The Major Robert Anderson Women's Relief Corps Number 44, Auxiliary to Post Number 360, Grand Army of the Republic, Department of Indiana, erected a stone monument that was dedicated on May 30, 1889. The monument, which was created by Indianapolis stonecutter James F. Needler, is located near the south end of the National Cemetery. The inscription on its north face reads: "In memory of the unknown dead who fell in our country's service in the War of the Union, A.D. 1861–1865, No name to bid us know, Who rests below, No work of death of birth, Only the grasses wave, Over a mound of earth, Over a nameless grave".