In 1925 Reginald served the 28th Field Battery (9th Field Brigade RA), which as the time was located in India. Twee years later he is mentioned as ADC to General Sir Edmund Ironside in the 1st Merchanised Field Artillery Regiment ( 2nd Division). A year later, in 1928, we find him with the 14th Light Battery (5th Light Brigade). He transferred to the 4th Field Battery (4th Field Brigade) next year and remained with the regiment until 1932 when he was incorporated in the 'I' Battery (1st Cavalry Brigade RHA).
Four years later he is serving in the 6th Medium Regiment RA and was appointed as GSO3 HQ Western (Independent) District, Quetta in 1938.
During the Second World War, he was at HQ Eastern Command and commanded from 1942 the
Tactical School, Poona; in command of 130th Field Regiment RA (14th Indian Division) as an Senior Artillery Instructor. A year later he was Instructor at the School of Artillery, Bombay. Reginald saw his first war service in 1944 when he commanded the 115th Field Regiment RA (19th Indian Division).
In 1945 he served as Colonel of Artillery Training at the War Office and took command of the
4th Medium Regiment RA; Anti-Aircraft Command and the 44th Searchlight Regiment RA during the following years.
During the Pakistan campaign in 1952, he was Commander of the Corps of Royal Artillery.
In 1954 he was in charge of the 5th Anti-Aircraft Group and retired from the army a year after.
Reginald wrote the following chapter in The Royal Artillery Commemoration Book 1939-1945;
‘A story of the march of 115th Field Regiment RA with 19th Indian (Dagger) Division
by Brigadier R. A. G. Nicholson, D.S.O.’