I'm digging.
FIRST there's robert's link on this site, in the same Unit and COMPANY as your dad
http://www.6thcorpscombatengineers.com/RobertHoedel.htm
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Army Services Corp
Southern Base Engineer Group 2 was formed in the European Theatre of Operations on August 1, 1943. The units were as follows:
332nd Engineer General Service Regiment
333rd Engineer Special Service Regiment
354th Engineer General Service Regiment
437th Engineer Maintenance Company
416th Engineer Dump Truck Company
419th Engineer Dump Truck Company
517th Engineer Dump Truck Company
518th Engineer Dump Truck Company
389th Engineer Battalion (separated unit)
359th Engineer General Service Regiment
1302nd Engineer General Service Regiment
1278th Engineer Combat Battalion
204th Rngineer Combat Battalion
300th Engineer Combat Battalion
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359th XO'd by Colonel Edwin J Withers, U.S. Army: Chief, Troops Division near Reims, France and Executive Officer 359th Engineer General Service Regiment. (end of 44 and into 45)
359 constructed pipelines, storage tanks, and pumping stations for fuel from beaches to Paris after D-Day. The 359th was the largest unit in this operation. http://books.google.com/books?id=KXDlNtXZFUwC&pg=PA405&lpg=PA405&dq=%2B%22359TH+Engineer+General+Service+Regiment+%22&source=bl&ots=ukfYTtrirv&sig=0bwHHk2VqM0XvKA-T50sllNbMeY&hl=en&ei=6xuETYLjCoiXtweunODDBA&sa=X&oi=book_result&ct=result&resnum=4&ved=0CCcQ6AEwAw#v=onepage&q=%2B%22359TH%20Engineer%20General%20Service%20Regiment%20%22&f=false
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1942 were used to fight the white river flood in Arkansas
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Possible patch/insignia
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there is a 359 engineer regiment book. http://www.worthpoint.com/worthopedia/scarce-wwii-unit-history-359th-engineer-regiment It is out there somewhere. You might want to write to the US Army records is FT LenWood, and in PA for histories.
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It's a start! Happy hunting and welcome!