Stephen Ellis's ledger shows a Sergt. Major Rehm - Oct 1907.  

HBEA 1912 - Office Superintendent and Storekeeper, Survey Dept. Gravestone in Nairobi, Forest Rd shows him as Worshipful Brother and was erected by his Masonic brethren

EAHB 1905 - A. Rehm - Military Clerk, Entebbe Letter in my possession from A. Rehm to Bunting sent from Nairobi 22nd January 1909. Letter talks about the Nairobi Chapter and also mentions colleagues in the Survey Dept.

Drumkey 1909 - Survey Department - Clerk and Accountant

Drumkey 1909 - Lodge Scotia, No. 1008 S.C. - Tyler

Drumkey 1909 - Directory of Residents - Sergt.-Major A. Rehm, Survey Dept., Nairobi

CWGC - Nairobi (Forest Road) Cemetery - Major A.G. Rehm, MC, Special List and East African Pay Corps. 12th April 1921. Block 6, Gr. 100.

Jews - 1912 - Laying of the Foundation Stone of the first Nairobi synagogue - ….. Corn,wine and oil handed to H.E. by Messrs Bland, Rehm and Mitchell, attending Freemasons

Advertiser - 2/10/1908 - Masonic Temple consecrated - assisted - Bro. Rehm

Gazette - 7/4/15 - Liable for Jury service, Nairobi District - A. Rehm, Survey Dept.

Gazette - 26/8/1914 - Appt. - A. Rehm, Volunteer Forces, East Africa Regiment, to be Captain, to date August 6th 1914

Gazette - 11/8/1915 - Appt. - EA Pay Corps - To be Paymaster - Captain August George Rehm, EAR

Member of Lodge Harmony - Joined 4/6/06, dies 1921

Nairobi Forest Road cemetery - Augustus George Rehm, British, age 51, died 12/4/21

North - Appt. HQ Sgt. Clerk with the Uganda Rifles 1/11/1899; Orderly Room Sgt. resident at Entebbe 19/11/1900; promoted to Head Clerk in Commandant's Office 1/4/1901; Sgt. Maj. refused permission for another 2 year tour, to return to UK as soon as possible to look after his wife & 4 children as wife had 'taken to alcoholic excess' (WO, FO 2) Dec 1902; At Camp Budachio on Anglo-German boundary 3/3/1903; re-engaged for 3 years March 1904; arr. Mombasa from Europe 6/4/1904; Member of the Anglo-German Boundary Commission survey, issued with Public Officer's Game Licence Seyidie Province 10/4/1905; Boundary Commission dissolved Dec 1905; 1906 at Entebbe; 'Six feet six inches in height and of a commanding presence'

Masonic - Orient Chapter SC consecrated 19 Sept 1919 by M.E. Comp A. Rehm as MEZ, M.E. Comp J. Grice as MEH, M.E. Comp Chas. Udall CBE as MEJ

Leader14 - Office Superintendent and Storekeeper, Survey Dept.

Red Book 1912 - A.G. Rehm - Nairobi

Red Book 1912 - Survey Dept. - Office Supdt. - A. Rehm

Considine - New European School Nairobi - Mabel Rehm - b. 24/3/1898 - 12/9/1910 - Parklands

Considine - New European School Nairobi - Herbert Rehm - b. 1/11/1899 - 12/9/1910 - Parklands

Gazette - 12/11/1919 - Register of Voters - Nairobi, North Area - August George Rehm - Chief Paymaster, EAPC, Fort Hall Road

Red Book 1919 - Survey Dept. - Office Superintendent - A. Rehm MC

https://ourwar1915.wordpress.com/2017/08/26/9873-sergeant-august-george-rehm-2nd-battalion-the-manchester-regiment Re his son: 9873 Sergeant August George Rehm – 2nd Battalion, The Manchester Regiment  Born at Hartshead in Lancashire on 14 May 1890, August was the son of 1070 Corporal August Rehm, of The Manchester Regiment, and Elizabeth Rehm, and was baptised at St John the Evangelist Parish Church in Hurst on 6 July.
August’s father, baptised Auguste Friederike Luise Rehm, had been born on Heligoland in 1865 and had been employed as a waiter at the Imperial Hotel in Belfast before moving to Higher Broughton. He attested for the 4^th Militia Battalion of The Manchester Regiment, aged nineteen years and ten months, at the Regimental Depot in Ashton-under-Lyne on 2 May 1885. On 19 June August re-engaged as a regular soldier and was posted to the 1^st Battalion on 3 October. He was drafted to the 2^nd Battalion on 2 January 1886 and at the time of the birth of his son was serving at the Regimental Depot. 
Having served at home and in India, August senior, who had held the rank of Colour-Sergeant for eight years, was posted on attachment to the Uganda Rifles on 9 November 1899. He returned to the Manchesters at the end of his posting and was stationed on Guernsey with the 2^nd Battalion when he was discharged, on the completion of 21 years’ service, on 18 June 1906, aged 41 years and six months. Colour-Sergeant Rehm’s conduct during his military service was described as “exemplary” and he stated that he intended to seek employment in Nairobi as a clerk. He was evidently qualified, as he was described as a: “Very good clerk & accountant & good German scholar. Perfectly sober & thoroughly trustworthy. Manages East African natives with ability. Talks Swahili.”
August junior was aged fifteen years and six months when he attested on a Long Service Engagement for twelve years with The Manchester Regiment at the Regimental Depot in Ashton-under-Lyne on 5 March 1904. At the time of his enlistment, August was four feet, 11 5/8 inches tall and had attended the Albion School. Posted to the 2^nd Battalion on Boy service, August was awarded his 3^rd Class Certificate in Education on 25 May 1904, and passed his 2^nd Class Certificate on 9 March 1905. Boy Rehm was awarded a Good Conduct Badge on 5 March 1906 and on 5 September, on reaching the aged of eighteen, became a Private. Appointed Lance-Corporal the following year, he lost his stripe on 31 December 1908 as a result of misconduct, but was re-appointed on 21 August 1909. Rehm was promoted to Corporal on 8 June 1910 and was awarded his Physical Training Certificate at Aldershot on 30 April 1911, and the following year attended a course in Transport Duties while stationed at Curragh Camp.
On 4 March 1913, Rehm was appointed a Staff Sergeant-Instructor and on 9 October was posted to the Regimental Depot, where he reverted to Lance-Sergeant. On 14 April 1914, he received promotion to the rank of Sergeant and on 15 May returned to the 2^nd Battalion at the Curragh. He sailed for France on board the S.S. Buteshire from Dublin on 14 August and disembarked at Le Havre two days later. Sergeant Rehm was killed on 26 August while the 2^nd Manchesters were in support of the 2^nd Battalion, The Suffolk Regiment, holding positions on the right of the road between Montay and Reumont. Confirmation that he was amongst the dead was received by the Infantry Record Office at Preston on 5 September.
Preserved in his surviving service papers is an enquiry that The Record Office received  on 10 September from Ireland regarding his fate:
“Miss Mollie Doyle
Monaghan’s View
Brownstown
Curragh Camp
Kildare

Sep: 8th 1914.
Sir,
Will you kindly give me some information regarding Sergt. A. G. Rehm, 2nd Manchester Regt. I have heard he is killed, but have seen no account.” 
On 3 May 1915, the War Office instructed the Infantry Record Office at Preston that any personal effects of Sergeant Rehm should be forwarded to his father, Captain A. Rehm, who was at that time serving with the Director of the Surveyors’ Office of the Survey Department in Nairobi.
Following the institution of the 1914 Star, under Army Order 350 of 1917, Sergeant Rehm’s father, who by this time was a Paymaster with the East African Pay Corps in Nairobi, made an application for his late son’s medal on 28 March 1918.  The clasp for August’s 1914 Star, British War Medal and Victory Medal were received by his sister, Mabel, on 10 August 1922.
Sergeant August George Rehm has no known grave and is commemorated on the Le Ferte-sous-Jouarre Memorial.