"Yes, the order of battle and equipment I listed in my original post was based on the Pershing Expedition against Pancho Villa. In my posting I had the organization broken down to the Platoon level with the Benet Mercier Automatic Rifles, Grenadiers and grenade launchers at the Squardron level based on the books TO&E."
And that would be useful, if the presence of those weapons were confirmed by any other source as being present on the Western Front. In the case of the 2d US Cavalry, it's unclear what equipment was present. Most of the regiment was employed essentially as grooms and drivers for the AEF's transport animals. Only the provisional squadron mentioned above was configured as a combat formation.
What might be helpful to you is this:http://www.archive.org/details/cu31924030724193
"However, Great War seems designed to compact Platoons into Squadrons for Cavalry."
There's a bit of garbling of cavalry in "Great War": for example, calling the larger British unit a battalion rather than a regiment. Gamers seem to get confused by cavalry organization: where infantry subordination is platoon-company-battalion, in the cavalry--US and British--it's troop, squadron, regiment.
But to do this AEF list right, it would seem important to recognize that the entire US cavalry force is only one squadron, commanded by a Lt. Col. (LTC), and the squadron consisted of three, notionally four, troops. The two main organizational problems with the posted list are that it reads:
"A Regiment Command group consists of an officer and 2 trooper. Typically a Major at a cost of 20pts, or a Lt. Colonel at
a cost of 50pts."
There should be no regimental command group, as only the single provisional squadron was used in combat.
"A Squadron consists of a Squadron Command Group and between 2 and 4 Troops.
The Troop Command Group consists of a Captain and 2 Troopers for 45 points.
A Cavalry Troop consists of 9 Troopers for 100 points."
If following the "Great War" model, "Troop Command Group" should be changed to "Squadron Command Group". The only question then would be whether to upgrade the squadron commander. In a British or US cavalry squadron, the commander should be a major (just as a British infantry company commander should be a major); troops were commanded by captains (see page 14 of the TO&E linked above). In the case of the 1d Cavalry's provisional squadron, he could be upgraded to lieutenant colonel in the specific case of Hazard.