Hello John
"If you get the chance I'd appreciate your translating the principal points of the text"
Here is an automatic translation by google for the full text present in the thread I gave in my precedent post-I think that this translation is good
enough and I hope understable for you!
Version traduite de la page http://albindenis.free.fr/Site_escadrille/As_Marcel_Hughes.htm
You say part of the squadron symbol is visible on the plane in the photo. Is that the white line or the black looking area on the top of the fusalage? I assume his plane is a Spad S. XIII, would this be correct?
Yes on the top and side of fuselage too-You can see part of the black pennant

Your photo (taken in may 1918) can be seen page 12 of Osprey "Spad XII/XIII aces of ww1"by jon Guttman-
The aircraft is not a Spad XIII but a Spad XII, a cannon -armed fighter based on a spad VII-This cannon was very delicate to handle and reserved to Aces-
Any idea what the two medals are that Marcel is wearing?
at his right Légion d'honneur (Marcel Hugues was Commandeur de la Légion d'honneur at the end of his life),left Croix de guerre avec 8 palmes
(+ 12 citations a l'ordre de l'armée)
Marcel Anatole Hugues - The Aerodrome - Aces and Aircraft of World War I
As I recall Fonck was a collaborator in WW2
Fonck was not really a "collaborator",but at the beginning of the ww2 he thought that Petain was the best man to take in charge the interest of his country, and that precedent socialist governments was responsible of french defeat in 1940-Anyway he was finally disavoued by Philippe Petain in 1942 and he received a "certificate of participation" in the Resistance, signed on 28 September 1948 by the Commander Sautereau, with the words: "Mr. Fonck, René, without uniformed member of the French forces fighting a participated in territory occupied by the enemy, the glorious struggle for the liberation of the motherland. "
He was nethertheless interned on september 1944 but released the end of the year without charge against him.
Cordialement
Bruno