RFC pilots at Old Sarum, Salisbury Nov. 1917-Jan. 1918

[logilby]

This is a photo of my great uncle and three other pilots. Can anyone either help with the identification of two of the men, or tell me anything about the men from what they see in the photo? My great uncle, Lyman H. Cunningham (103 sqn), is standing second from the left. He arrived in London from Canada 19 Nov 1917. He trained at Old Sarum and was killed on 13 January 1918 there. I believe the photo was taken in that time period. The pilot on the far right is Lt. William Henry Townsend (57 sqn) who was killed 23 April 1918 in France. I do not know the identities of the other two men. Can anyone help? Any thoughts?

Lois