That’s a big misconception about Greece right here…
Greece is a NATO nation, which means (similar with Turkey for example) they have a mixture of vehicles from European and US origin and even some Russian ones and some modifications of them.
Airforce side , in ww2 at start we had a mixture of PZL P24 (a variant of P11 that Poland didn’t use ) , Fairy Battle B.1 , Potez 633B2 and Gloster Gladiator…and some other vehicles of pre-war era.
During WW2 , the squadrons that survived fought mainly in Africa … with a mix of equipment from US and British origin such as Spitfire VB/ VC, IX HF/LF , Hurricanes, Blenheims , Helldivers and even Spit XVI (though post war it was a ww2 plane).
50’s to 70’s we had mostly US equipment we used mainly US types, F-86s, F-104Gs, F-5As , F-84G/F and F-102s.
After 1974 ( Post Greek Junta era) they added in the equipment Mirage F1CG, F-4E and A-7H/E .
After 1988 the types consisted mainly of variants of F-16 constantly upgrading and M2K EG…along with the everlasting F-4Es , while in 90s we stopped using F-104s and by 2000s we retired A-7s and F1CGs with the major force being F-16s and M2ks (their upgraded variants). If we go till now add Rafale in the mix of F-16s and M2K-5s and the upgraded F-4E AUPs …
Aka … Nothing to do with Germany. Basically if you add us in Germany, the German Air Tech tree will get one of the main US fighters, the main French fighters and MiG 29 …
In fact it could be good for the German Air Tree.
Other than that, in Ground tree for years we mainly use various types of US equipment until the arrival of first Leopards…and even had some BMP-1s and a variant of BMP we replaced the turret with ZSU-24 turrets …
The funny thing is naval side… our main types were US, until the point of MEKO frigates and 209/214 submarines of German origin… yet the main frigate was Kortenaer S of Netherlands origin…and some La Combattante missile boats of French origin and some US ships along the line like Knox-class Frigates (now retired) as well as C.F. Adams destroyers (retired). That makes it as fact that before 70s-80s our main ships were US origin…
So just because we have Leopard tanks makes us us in common with Germany?
For the most part we are heavily related with US and French vehicles and depending on the era you can even see some main UK vehicles…
Adding us in Germany, yes… would help their tree , no comment about it , especially post 1970 equipment and ww2 equipment (access in Spitfires) , but…wouldn’t it make it jack of all trades ?
On the other side it is a good idea… i don’t know.
But just for game reasons… i don’t think that we do have many other reasons than 3 specific types mainly in the modern era (1980s +) in relation to Germany… when we practically have US inventory from 1950 and then as a core.
I’d prefer a Balkan tree , which will be a multinational mixture of equipment from the get go, could be fun.
Or else a NATO mix tree along with PACT mix tree, where you could insert vehicles from many nations and create a solid core of vehicles , without defying logic on it…
Else, we go like China tree and i very much dislike what they did because at some point we would have F-16s/M-2Ks/Su-27s along with any indigenous and any mix of Soviet and US made vehicles until post Cold War…essentially making them all in one tree and even favorable in some cases comparing to USSR/Russia and US trees . Each tech tree should have something unique…