Officers at the Citadel, Plymouth in 1916

With the anniversary of the commencement of the First World War coming up, I thought I'd post this interesting photo of officers at the Citadel in 1916.
I bought this interesting postcard on ebay (for £1.99!). The caption reads: 'Officers' Course of Gunnery, Citadel, Plymouth, February 1916.' The photographer is J.W. Barter of Plymouth. Written on the back in ink is: 'Yours sincerely, Frank H Bullock. 29th March 1916.'
It's a lovely picture, let's hope that most of them managed to survive the war.