Detailed Instructions: Generate a correct and concise answer for the question based on the words in the context.
Q: Context : Colonel Reginald Edward Harry Dyer CB (9 October 1864 -- 23 July 1927) was an officer of the British Army who, as a temporary brigadier general, was responsible for the Jallianwala Bagh massacre in Amritsar (in the province of Punjab).
Question : Which armed forces utilised the service of Reginald Edward Harry Dyer?
A:
British Army