If on only one example, in the recent Belgian Tender (which led to adoption of the F35) appeared a wholly new operational requirement for the Air Force to do stealth-requiring missions, such as SEAD (suppression of enemy air defense) [1]. Up to then, the Belgian Air force was not trained nor expected to do such aggressive undertakings. It seems this requirement came from NATO.
[1] https://www.latribune.fr/entreprises-finance/industrie/aeron...
PS : Apologies for my source being in french, there might be some english versions of the story somewhere. The guy reporting the story is Stavros Kelepouris.