Attached is a letter from my dad to his mom dated May 20, 1943 in which he writes that he was in 3 battles: Kasserine, Berzita and Gasfa...some misspellings there...(plus requests for Colgate tooth powder, tooth brush, flash light, gum, cigarettes and chocolate candy matches...ha!). An interesting nugget in there about his unit assigned to protect FDR "and all the big shots" in Casablanca!
There is another letter written after his being wounded, but he does not say where or how it happened so I did not take a picture of it. The handwriting on it is different from the attached letter, which makes me think that it was dictated. He did have a shrapnel wound to his leg is all I can say. Also attached is something I found that confirms that he was assigned to the Medical Department. I do have a memory of him saying that he drove an ambulance.
See, this is all starting to make sense since other info states he was a truck driver before the war. I wonder how that was related to the Medical reference on his enlistment paperwork? It's clear he must have been transferred to another unit before deploying to Africa. Maybe they needed medical personnel since North Africa was the first "toe dip" in the African-European theater for the U.S. I looked at the letter you posted and the address says Company B, 20th Engineers. Here's a website dedicated to the 20th Engineers and pretty much confirms what your father says in his letter:
http://www.20thengineers.com/ww2.html
We'll keep digging, my friend!
Gary
Proud Grandson of Randall Gates
Mechanic, A and H&S Companies, 292nd Engineer Combat Battalion, 1149th Engineer Combat Group