I am going to start listing links for you and other who may be searching for info on this unit. Would be nice to have it all in one spot. So it looks like they were part of 1st Engineer Special Brigade assigned troops and attached units.
http://ww2veteransmemories.com/al-rose-1st-engineer-special-brigade/
Here's a great page all about quartermasters on D-Day Normandy
http://www.dday-overlord.com/eng/american_forces_2.htm
https://www.fold3.com/image/290391922
http://normandyallies.org/howard-teal-of-3939-quartermaster-gas-supply-company/
https://www.backtonormandy.org/the-history/support-troops-usa/quartermaster/support12940.html
http://www.longshoresoldiers.com/2010/07/1st-engineer-special-brigade-assigned.html
You should contact NARA in Maryland to see what records they have on this unit. See my research section for further information. ;)
Proud Daughter of Walter (Monday) Poniedzialek
540th Engineer Combat Regiment, 2833rd Bn, H&S Co, 4th Platoon
There's "No Bridge Too Far"