Little is known of Lt. Day at this time. He and his pilot, 2nd Lt. A.C. Pepper were listed as KIA on 06/04/1917.
"6Apr17 Ltn. K. Wolff-6 R.E. 8 10.15 Bois Bernard 49
#A.3421, 59 Sqn. RFC, 2/Lt. A.C. Pepper,DOW & Lt. W.L. Day,KIA"
If you have any information about Lt. Day, please contact me, thank you.