I don't know anything about the 1302 Engineer Regiment and couldn't get a hit on google.
I went to the AMERICAN BATTLE MONUMENTS COMMISSION site and entered the WW2 graves and entered the search for Unit. It came back with 3 soldiers from that unit. Here are their info.
1302nd Engineer General Service Regiment
Kenneth R. Powell, Tech 4, (hometown) PA
Died 13-Nov-44
Buried at Cambridge American Cemetery, in UK
Manuel Tovar, Pvt, IL
Died 22-Oct-44
Buried at Cambridge American Cemetery, in UK
Charles W. Westcott, Sgt, PA
Died: 6-Sep-44
Buried at Cambridge American Cemetery, in UK
All were buried in England. I thought this might give a clue as to where they were located. Maybe.
Steve
Caution while doing a google search. Apparantly the MOS(rating class) for an engineer in the Marines is No. 1302.