[Petitpoucet]

Hi,

You were right, Tom : GC II/5 means "le deuxième groupe de chasse de la cinquième escadre", but we vocalize it " GC deux cinq ".
Each groupe de chasse had two escadrilles, first and second in the first groupe, third and fourth in the second, like in GC II/5, and fifth and sixth in the third groupe when they were created before the war.

Regards