But the Winner is not the one to make waves, and change the winning Play Book.
Germany wins in 1917.
Tanks are still those giant Rhomboids, without the 1918 Tankettes, They were not a War Winner,, and while Germany will examine then, The War Staff will not have much interest.
Armor will develop more like Italy's Armored Cars, & Trucks of the 20's-30's
Aircraft will still be 1917, with those Giant 4-6 Engine Bombers that got converted to Passenger Carriers never Built,
Nor will the 1918 Fighters, be developed, and 1918 saw some development work that would lead to Mono Wing, & all metal designs.
Without the US entry all those thousands of Surplus Planes and Pilots that Barnstormed around the US and Europe are Gone. So are the Pilots that started PanAm and other companies.
No 1918 Carrier attacks on the Zeppelin Yards, will sightly delay the Carrier development, for Political Reasons. [Battleship Admirals more entrenched]
No US in War, means no US Soldiers in the Trenches with Jammed Guns, So Thompson never designs the Thompson Gun. [not sure if this is a Plus or a Minus.
Less Stormtroopers and less development of the Tactics, and less need to develop new Guns.
I see TTL's Military Tech running about 5~10 Years behind OTL.
TTL will be a little more Conservative than OTL, with Civilian Tech running 2~5 years behind OTL