I found some info on the 363rd Engineers, the lack of information on this unit is due to the fact they served in a forgotten theater of the war...Iran.
The proper designation for them is the 363rd Engineer Special Service Regiment.
In Iran they were under The Persian Gulf Command which operated the vital supply route for Lend-Lease war materials going to Russia.
The 363rd Engineer Special Service Regiment duties took in supervision of pipelines, water filtration and sewer systems, and maintenance of supplies for utilities.
Also in Iran under the Persian Gulf Command was the 334th Engineer Special Service Regiment who worked on & maintained the roads & railroad.
Some other units in the command were Railway Operating Battalions, Ordinace Heavy maintainance Companies, several Quartermaster Truck Companies, & the 19th Station Hospital.
There were only about 7 Engineer Special Service Regiments formed in WWII. They were Staffed with highly skilled construction men & were well equipt to handle large infrastructure projects. Most regiments were activated at Camp Claiborne, La.
The other Engineer Special Service Regiments i found:
333rd Engineer Special Service Regiment, has campaign credits for Normandy & Northern France. They were assigned to Southern Base Engineer Group 2 which was formed in the European Theater of Operations United States Army on 1
August 1943.
361st Special Services Engineer Regiment has Campaign Credit for Rhineland.
369th Engineer Special Service Regiment, history .pdf posted in prior post.
the regiment went to Guadalcanal and soon after were re-designated as the
1394th Engineer Construction Battalion.
1007th Engineer Special Service Battalion (Barge Contruction) served in India/ Burma
330th Engineer Special Service Regiment, activated as a Special Service Regiment, Redsignated a General Service Regiment during training at Camp Claiborne.
332nd Engineer Special Service Regiment, activated as a Special Service Regiment, Redsignated a General Service Regiment during training at Camp Claiborne.
393rd Engineer Special Service Regiment, no info.