900th Antiaircraft/Automatic Weapons Battalion

I keep running into dead ends while researching my father's military service. He served in the 473rd Infantry Regiment, which was not created until January, 1945. It was part of Task Force 45 and took part in the Italian campaign. Prior to being converted to an infantryman, he was in an AA/AWB group, the 900th. He received his training in Camp Edwards, MA for 2 months in 1942, then was shipped overseas. I kind of lose the thread there. I can find no reference to what happened between January 1943 and January 1945. I know he was overseas, but I don't know how to begin looking for where he was. His separation record lists 22 months as a gunner, antiaircraft, 4 months as a rifleman, and 6 months as a squad leader.
During his lifetime, (he died in 1990), he mainly alluded to hid service with the 473rd, and the guys I met were all from this outfit. If anyone can enlighten me about AA units (40 mm), how they were attached and used, or any other specifics, I would be appreciative.

 

Seacon, as you've probably seen from other threads, I did discover that information. He was in Co. K, and many of his company members attended an annual reunion through the 50's and 60s. I was privileged to be able to attend some of them and got to know a number of the men and their families. In fact one, Larry DiVito, was my godfather, and my parents' best man at their wedding. Sadly, all of the men and their families, as far as I know, have died.

Thanks for the offer of help.

 

Thanks, Terry. I kind of knew that. I remember my mother telling me that he went into the infantry "after there were no more planes to shoot down." Since he most associated himself with the 473rd, I'm more than happy to limit my investigation to that unit.