Converted to a troop transport, she spent the rest of the war operating under a United States Army charter.

The U.S. Navy acquired Floridian from the Shipping Board on 28 January 1919, assigned her the naval registry Identification Number (Id.

Floridian was assigned to the Cruiser and Transport Force and designated to carry U.S. Army passengers and cargo.

Units aboard included, as described by the Seattle Times, 435 "men of the 148th Field Artillery, 41st Division... [with] Field and Staff, Medical Detachments, Headquarters Company and Battery E. Other troops on board were the 509th Engineers, Headquarters and Medical Detachments and Companies A to D inclusive; members of the 369th Service Park Unit.

The 1,829 men aboard included, per the Seattle Times, "... the 337th Field Remount Squadron and casuals for Camps Dodge and Bowie.