As stated, 750th Tank Battalion was an element of First Army, not 104th Infantry Division. The 104th was only one of several principal commands to which the battalion was attached. An infantry division's table of organization was fixed by law and limited to a headquarters, special troops, military police platoon, reconnaissance troop, counter-intelligence detachment, quartermaster company, ordnance company, signal company, medical battalion, a battalion of combat engineers, three regiments of infantry and a regiment of artillery (later reorganized into four field artillery battalions). Period. Other units, usually specialized (tanks, tanks destroyers, antiaircraft artillery, etc.), were attached at various times for various reasons. Not being organic to the division, these units could be withdrawn and reassigned without the consent of the division commander. The 750th landed in France 3 October 1944 but wasn't attached to the 104th until 16 November. Most, if not all, of this period would have been devoted to orientation, training and fitting out. The battalion was withdrawn from 104th control and reassigned only eight days into the Battle of the Bulge. All this is moot, however, since your man didn't arrive until early March.