This is going to present difficulties as there appears to be a problem in unit identification.
First of all an Air Service Group generally did not have aircraft assigned to it--they fixed or modified them and sent them on their way.
Secondly 9th AAF was primarally a tactical outfit, rather than STRATEGIC.The B-17 was not a usual fixture around 9th AAF stations.The B-17 was a high altitude Strategic bomber--the 9th dealt with light and medium inventory as well as fighter-bombers and troop carriers.
However, the 9th did fly converted B-24s called C-109s which were converted specifically for carrying gasoline.Are you certain the plane in the photo is a B-17?
I did not find reference to the name in my resources for either B-17s or B-24s.I could not find reference to the 492nd Air Service Group either.I have the complete station and units assignment listing for 9th AAF as of SEP44 and this is fairly specific down to MP platoons, so not seeing the 492nd Air Service GROUP indicates to me that there is an identity problem we have to overcome before we move on to finding additional info.