Jacobsen organized the Field hospital under heavy enemy fire, when used captured German Army Medical Staff.

[2] His official Silver Star citation reads follows: Captain Arnold Windom Jacobsen displayed unusual courage and resourcefulness during the attack on the Argonne sector.

[2] Jacobsen was subsequently appointed commander of the Marine detachment aboard the battleship USS West Virginia on 26 August 1924 and served almost two years at sea.

Jacobsen was transferred to the Marine barracks at Philadelphia Naval Shipyard in June 1938 and was appointed to the capacity of assistant quartermaster of the Depot of Supply.

In December 1942, Jacobsen was appointed commanding officer of the Marine Corps Depot of Supplies at San Francisco, California.

Jacobsen was placed on the retired list in July of the same year and advanced to the rank of major general for having been specially commended in combat.

By exercising sound organizational ability and leadership General Jacobsen directed the development of plans for expansion and handling the overseas supply problems of all Marines in the Pacific Ocean area.

He was responsible for the establishment of a smooth working method of furnishing and shipping supplies to all overseas Marine Corps units.