Jag,
Don't take me so serious. My humor is a little sublime. No need to apologize.
The only thing I keep thinking is 45th, 180th, G company . I keep forgetting theres more then the 180th in the 45th
What? More than one what in the 45th Division?
If you refer to the 180th Regiment then you are referring to the 45th Division. One is a sub-part of the other. While at the front, a soldier would usually refer to his unit as the 180th Regiment----for example. Anyone serving in that general area would know what division he was referring to.
On the other hand, if he answered "I'm from Company G", then Yes, that would be too vague as there was a Company G in each regiment and then you wouldn't be sure which regiment he might be referring to.
If you watch the COMBAT TV show, there is at least 3 episodes where someone askes Sgt. Saunders what unit he was with. His only answer: "361st" or one time "Company K, 361st". By his answer he was referring to the 361st Infantry Regiment, which we all know was part of the 91st Infantry Division that fought in Italy---not in France as portrayed by the TV show.
I just want to make sure you understand. And I'm trying to keep this FUN. Please email me if I can be of further help.
Steve 
PS: I usually don't paste a happy face after my joke. That gets me in trouble a lot.