Drum was a companion of the District of Columbia Commandery of the Military Order of the Loyal Legion of the United States - a prestigious military society composed of officers of the Union armed forces and their descendants.
Among other honors, both Camp Drum, a 60-acre army base in Wilmington, CA, and Fort Drum, the so-called "Concrete Battleship" situated at the mouth of Manila Bay, were named for him.
Later service
Drum was Assistant Adjutant General for the Department of California from June 1865 to October 1, 1866. He was appointed Assistant Adjutant General for the Department of the East, with headquarters in Philadelphia, Pennsylvania from December 27, 1866, to January 6, 1868. He was appointed Assistant Adjutant-General, for the 3rd Military District to August 1, 1868, and Department of the South, headquarters Atlanta, Georgia from March 20, 1868 to March 20, 1869,[2] and from April 3, 1869 to November 26, 1873 for the Military Department of the Atlantic.
Drum was promoted to colonel on February 22, 1869. He was again made Assistant Adjutant-General, for the Military Division of the Missouri, in Chicago from November 28, 1873 to May 2, 1878, where he commanded the Federal troops in the Great Railroad Strike of 1877. He then served until retirement in the Adjutant Generals office in Washington, D.C.[3]
On June 16, 1880, he became Adjutant General of the United States Army and was promoted to brigadier general. He retired on May 20, 1889.[4]