On 26 January, the squadron was ordered for overseas duty, and was moved to the Aviation Concentration Center, Garden City, Long Island.

However, on 16 February, the squadron was ordered to report to the New York Port of Embarkation at Hoboken, New Jersey, to board the former Cunard Liner RMS Carmania and sailed immediately.

3 Training Depot Station (TDS), RFC Lopcome Center, Nether Wallop, England on 17 March.

[citation needed] At the end of two months' training, the 154th was in complete control of two full Flights, consisting of about 24 airplanes, Sopwith Camels, Pups and Avroes.

In addition, squadron mechanics in the workshops, the airplane repair shops, the armorers in the gunnery school and the drivers in the Transport Flight had relieved a large proportion of the British personnel for service at the front lines in France.

On 16 August, the squadron was split up into several Flights for final training at advanced bases in England, before being re-assembled at Winchester on the 30th.

On 12 September the squadron proceeded to Le Havre, France, and moved to British Rest Camp No.2 there waiting further orders.

However, due to the sudden and unforeseen developments in the war situation, the squadron never received the transfer orders and was at Orly at the time of the Armistice with Germany on 11 November.

On 24 December, the 154th was ordered to demobilize and moved to the Base Port at St. Nazarine for immediate transport back to the United States.

Although National Guard aviation units had been regularly called upon to assist civil authorities since early in that decade, the 1927 flood marked the first time that an entire Guard flying unit and its government-issued aircraft had been mobilized to help deal with a major natural disaster.

[4] Governor John E. Martineau called up the 10 officers and 50 enlisted members of the 154th Observation Squadron, Arkansas National Guard, to help locate stranded flood victims as well as to deliver food, medicines and supplies to them and relief workers.

The unit also conducted aerial patrols along the Mississippi River scouting for weakened or broken levees.

The flood relief work of the 154th underscores the long-standing but little understood history of Air National Guard units and their pre-World War II antecedents in supporting civil authorities.

The unit completed its one-year training and returned to state control, but was recalled to active duty on 7 December 1941.

Most of the squadron sailed from the United States in September 1942 on the Queen Mary, with its first overseas station in Wattisham, England, 4–21 October 1942.

The unit went to Langley Air Force Base, VA where it was re-equipped with the F-84E fighter and completed transition training.

The unit maintained a 24-hour alert and supported worldwide tanker task forces by performing in-flight refueling of all types of aircraft.