Donald took up a temporary commission at the rank of Lieutenant in the R.A.M.C. on 5th July 1915. He gained promotion to temporary Captain on 5th July 1916. On 8th May 1917 he reported his arrival to the A.D.M.S., 11th (Northern) Division, who posted him to serve with the 33rd Field Ambulance. On 20th May 1917 he was transferred to the division’s Royal Engineers to serve as their medical officer.
He was then posted to serve as the Medical Officer of the 59th Bde Royal Field Artillery on 23rd September 1917. On 12th February 1918 he was transferred to serve as medical officer of the 58th Bde, R.F.A. to replace Capt G M Mayberry R.A.M.C. He was sent to I Corps Officers' Rest Station on 27th May 1918, from which he returned to the unit on 12th June 1918. The following month, on 2nd July 1918, his contract expired so he returned to the UK to report to the War Office. On 29th June 1919 he relinquished his commission, and subsequently made at least two trips to India: in April 1924 he returned to the UK from India on the SS "California" and in 1936 he sailed back to India returning to the UK later that year. He married Marjorie Lindsell Mitchell-Gill in Elgin in 1928 and they had a daughter, Mary June L Meek, who was born the following year. In October 1939, the three of them were living in The Old Rectory, Durrington, Wilts where Donald was practicing as a doctor and also assisting at No.1 Flying Training School at Netheravon. At the same time Marjorie was working for the Red Cross. Donald Meek was living in Haslemere, Surrey when he died in the Cottage Hospital, Eastbourne, Sussex. He was the son of James B Meek and Mary Elizabeth Meek. (Information researched and kindly provided by David, whose website to the 58th Bde, R.F.A. can be found at this website address https://58fab.com/ )