A pair of Dog tags was issued to each soldier during ww2.
It was used to identify the soldier for medical purposes mainly.
We have only one dog tag of this soldier so either the other one is lost or the soldier could have been killed in Action.
From this Dog Tag we can say that the soldier probably enlisted in the Army in 1942. He was an Officer (Serial Army Number starting with a O). He has the 1942 and 1943 vaccination check. He was blood type A and he was a Protestant.