Bonsoir
Teh De Turenne's unit in july 1915 was the VB 102
(GB1 was formed with 3 escadrilles:
VB1 on 23 novembre 1914 then VB 101 on 1/03/1915
VB2 on 18/10/1914 then VB102 on march 1915
VB3 (former BR14) on 5/12/1914 then VB 103 on 4/03/1915)
He was promoted as observateur Bombardier-In 21/07/1915
and only a few day later, was admitted as student pilot on 6/08/1915!
cordialement
Bruno