Patton commanded II Army Corps from 5 March to 15 April 1943, during the campaign in Tunisia. This is probably the period your Dad referred to. Originally 2d Battalion, 39th Engineer (General Service) Regiment (2/39 EGSR), the battalion became 2/19 ECR when the regiment was redesignated 19th Engineer (Combat) Regiment. 2/19 ECR was redesignated 402d Engineer (Combat) Battalion in March 1945 in Italy. If C/402d ECR is the unit on his discharge, it's not necessarily the outfit he served with overseas. Do you have any other info?