Harry K. Pickett was born on January 9, 1888, in
Ridgeway, South Carolina, the son of James Cason and Wilhelmina (Heins) Pickett. Following high school, Pickett entered
The Citadel in
Charleston. While there, he served as first
Drum Major of the
Regimental Band, when it was organized in 1909. Pickett graduated in 1911 with a
Bachelor of Science degree in
Engineering and was commissioned a second lieutenant in the Marine Corps on March 15, 1912. Pickett's first assignment was at
Marine Officers' School at
Norfolk Navy Yard, in
Virginia, where he underwent officer training. Upon graduation in June 1914, Pickett was attached to the
4th Marine Regiment and sailed to the
Naval Station in
Guam. Before his regiment sailed to the Pacific, it took part in the
Veracruz Expedition during the summer of 1914. Upon his return to the United States, Pickett served for a brief period at the Marine barracks at
Puget Sound Navy Yard in
Bremerton in Washington. He was transferred to the
Marine barracks at Quantico in Virginia in January 1918 and attached to the newly activated
11th Marine Regiment. Pickett served as commanding officer of a company in the regiment's
1st Battalion. Following a temporary promotion to the rank of Major on July 1, 1918, he then assumed command of 1st Battalion. Pickett's regiment was attached to the
5th Marine Brigade under Brigadier General
Eli K. Cole and ordered to
France in October 1918. Picket and his unit arrived too late to see combat in
World War I and spent the rest of the war in the towns of
Issoudun and
Montierchaume. After several months of occupation duty, Pickett returned to the United States in August 1919. The 11th Marines were deactivated after arrival at
Naval Station Norfolk and Pickett reverted to his substantive rank of captain. He was then transferred to the Marine barracks at
Charleston Navy Yard, before he was ordered for recruiting duty in
Memphis in September 1920. Pickett was posted to the
4th Marine Regiment in October 1921 which then sailed with 2nd Marine Brigade, under Brigadier General
Charles G. Long, to
Santo Domingo. His regiment was tasked with the support of military government and suppression of bandits under
Desiderio Arias. Returning to the United States in June 1922, Pickett attended a field officers' course at the Marine Corps Schools in Quantico and then attached to Marine Corps headquarters. He was promoted to major on July 28, 1925, and assigned for duty with the Quartermaster Department under Brigadier General
Charles L. McCawley. From June 1928, Pickett was attached to the 1st Marine Brigade and sent to
Haiti. He took part in jungle patrols against Cacos bandits and also served as an instructor with the
Garde d'Haïti. He returned to the United States in January 1930 and served at Marine Corps headquarters until July 1935 during which time he was promoted to the rank of lieutenant colonel, on May 29, 1934. He then served at Marine Corps installations at Quantico and San Diego and completed a course at
Army Coast Artillery School at
Fort Monroe in Virginia. Picket was promoted to the rank of
Colonel on June 28, 1938. ==World War II==