Hi,
From
www.gazettes-online.co.uk
13-June-1916
2nd Lt E. A. DePass is seconded for duty with the R.F.C.
Dated 27th May 1916.
16-June-1916
The undermentioned appts. are made:
2nd Lt E. A. DePass, 3rd Co. of Lond. Yeo., T.F. Dated 27th May 1916.
17-October-1916:
'2nd Lt E. A. DePass is granted the temp. rank of Lt whilst employed with the R.F.C.' Dated 01st September 1916.
20-March-1917
2nd Lt (Temp. Lt) E. A. DePass to be Capt., with precedence from 08th November 1916, and to remain seconded. 21st March 1917.
31-Jan-1919
Capt. E. A. DePass relinquishes his commission on account of ill-health contracted on active service. Dated 01st Feb 1919.
I think his forenames were Eliot Arthur....
Regards,
Matt.