Thank you very much, the pleasure is mine!
If I may, I would give you some detail about where I found the dog tag.
The 8th EVAC Hospital of Pietramala was the biggest American field hospital in Italy during WWII.
This photo of Melvin C. Shaffer, shows how it was extended!
I have a vacation home in Pietramala from nearly 18 years, and I know almost everyone (is a small small town in the appenines) .
Some researchers like me and some of the elders and they told me that once the hospital was dismounted, on the hill where I found the dog tag, that are been downloaded 2 trucks per day for 6 months of used equipment of all kinds.
When for the first time I arrived at the landfill, could not believe my eyes, there was broken and not broken glass everywhere. Bottles of beer, coca-cola, parts of drip, parts of plasma bottle, needles, syringes. We found a lot of wonderful things and the area was so extensive that I could not see the beginning and the end!
Unfortunately I'm young and I arrived late, but many hunters have found wonderful material, talking about dozens and dozens of dogtag.
One summer a few years ago I was there with friends and we started a methodical excavation of the main site, I was lying with his head inside a hole I had dug in the ground, when, touching the wall above, the dog-tag is fall in front of my nose!
You can not imagine the surprise and joy at that moment, because after 30 years of excavations, I thought it was impossible to find something so unique, but obviously I was wrong! 
I think that the Major Rowell has lost his dog tag during assembly of the hospital (I do not know if it is a duty of the engineers, you can definitely help me on this) and then unloaded at the landfill at the time of dismantling the hospital .. .
Ps.: it is wonderful that you want to come to Italy to find the footsteps of your father here! Let me know when you think to come!
Your grandparents were Sicilian? The parents of your mother? (if I'm not indiscreet)