You are probably right, Richard.
The aircraft might be a Dayton-Wright.
But then not the Hisso engined "Bull Head"
- I'd say 1917 trainer biplane with Hall-Scott...
I though we were circling around the McCook Airfield.
Checking Wittemann-Lewis I found they were newly formed as "Wittemann-Lewis Co. Inc." in 1917 and ende pruduction in 1923 - aquired by Atlantic...
Same with Dayton-Wright - (Dayton-Wright Aircraft Co. Inc. formed in 1917 - sold to Consolidated and others in 1923)
This might have been "the years of change" at the McCook Airfield.
And I believe the prominent person standing infront of the prop the could be
Charles Franklin Kettering who should design new aircrafts in the adwise of Edward A. Deeds in 1917 after the USA joined the war.
(I though I heve seen this profile before...)
Cheers
Aquilius