I believe it is Company E of the 121st.Looking at the flag again, I see a tiny "stump" of a number 1 above the crossed rifles.Then a minuscule mark that might be the bottom of a two.
Here's a question: when he transferred from the 103rd Division (cactus) to the 8th Division, would his regiment have stayed the same?
Here's what it says about the formation of the 8th division:
?"In March, 1943, the 8th moved to Camp Laguna, Arizona, for six months of desert training. During the latter part of this period, it was de-motorized, reverting once more to its original status as a standard infantry division. It was also during this period of desert training that the 8th Division Band was organized from the 13th and 121st Regimental bands. The band of the 28th Infantry was transferred to the 65th Division at Camp Shelby, Mississippi."
I hope I'm not driving you nuts with all of these questions...