Following the conclusion of the Civil War, Closson served in artillery assignments at
Fort McHenry,
Maryland from July to October 1865,
Fort Schuyler, New York from October 1865 to June 1866, and
Fort Porter, New York from July to August 1866. Closson served on recruiting duty at various posts from August 1866 to January 1868. He served at
Fort Hamilton, New York from January 1868 to November 1872. His subsequent assignments included
Savannah, Georgia from November 1872 to December 1875,
Plattsburgh Barracks, New York from December 1875 to October 1876, and
Edgefield, South Carolina, from October to November 1876, during the
Red Shirt Campaign. On November 1, 1876, Closson was promoted to
major in the
5th Artillery. From December 1876 to January 1877, Closson served at Plattsburgh Barracks. He was posted to
Fort Barrancas, Florida from January 1877 to June 1879. After a leave of absence, from October 1879 to June 1880, Closson commanded the post at Fort Barrancas. He was in command at
Little Rock Barracks,
Arkansas from June to November 1880, Fort Barrancas from November 1880 to November 1881, and
Fort Niagara, New York from November 1881 to September 1882. From September 1882 to June 1888, Closson commanded
Fort Wadsworth, New York, and he was promoted to
lieutenant colonel on September 14, 1883. In April 1888, Closson was promoted to
colonel as commander of the
4th Artillery, and he commanded the regiment and the post at Fort Adams, Rhode Island from June 1888 to May 1889. From 1888 to 1893, Closson performed additional duty as a member of the Army's Board of Ordnance and Fortifications. ==Later career==