The Wyoming National Guard had gone to the Mexican boarder as infantry. . .

and they'd been mobilized in 1917 as such as well.

But they wouldn't be going to France as infantry.

Today the news hit that the unit was being disbanded and reformed into artillery, machinegun, and ammunition train units.

I'm  not sure what happened to the machinegun and ammunition train elements, or if those actually happened. They likely did.  I do know, however, that the artillery unit was in fact formed and is strongly associated with the Wyoming Guard during the Great War. 

This was not uncommon.  As the Army grew, the Army would be taking a lot of smaller units such as this and reconstituting them as something else. Both Regular Army and Guard units experienced this.

It's hard to know what the men thought of this.  A lot, but not all, had served and trained as infantry just the prior year along the border.  Did they have a strong attachment to it?  Hard to know.  Were some relieved, perhaps, that their role, in some instances, wouldn't involve serving as infantrymen in the trenches?  We don't know that either.