Your dad's unit, 747th Tank Battalion, was non-divisional, and was assigned to other units on an as needed, where-needed basis.
Itwas activated at Camp Bowie, TX, 10 Nov 42; departed NYPE, 11 Feb 44; arrived England, 23 Feb 44; arrived France-ETO, 7 Jun 44, (D-Day, plus 1).
Normandy, 6 June 44 / 24 July 44; Northern France, 25 July 44 / 14 Sep 44; Rhineland, 15 Sep 44 / 21 Mar 45; Central Europe, 22 Mar 45 / 11 May 45.
The battalion would have been on the line for an estimated 330 days.
I have no estimate as to total casualties, or of the casualty rate, but all things considered, I would imagine that both ran high.
As noted above, the unit was assigned to larger units when needed.
One such example was its assignment to the 29th Infantry Division per the following dates:
17 May 44 / 17 Aug 44 28 Sept 44 / 6 Mar 45 29 Mar 45 / 23 July 45.
The Blue and Grey patch of the 29th ID went ashore on Omaha Beach , 6 June 44, followed by 743rd and 747th Tank Battalions, 7 June 44.
As the battle moved off the beaches, the troops met a different resistance in the form of dense hedgerows, which the Germans successfully manned from the side opposite the invaders. If a man managed to penetrate the rows, he would be immediately fired on by well positioned German troops.
In his wonderful text, CITIZEN SOLDIERS, author Stephen E. Ambrose specifically refers to your dad's unit for having conceived a method of breaking through the rows.
This consisted of planting high explosives, much like in mining operations, then blowing a hole through the row, allowing the tanks into the open fields beyond, where they played havoc on the German defenders.
If you would like to see the account of the 29th ID, enter <29th Infantry Division Order of Battle WW II>, under SEARCH.
Their history is pretty much the same as the 747th would be, considering that it was attached for almost the entire battle history of the 29th ID.
If you are unable to call it up, let me know, and I will assist further. OK ?