Focuses more on combine the best units with eachother than using brute foce.

this does require knowledge of the strengths of varoius units and their preformance in diffrent terrain.

Flexibility is the main strength but it sacrifises specialisation so airpower or naval power migth be lacking behind the more territory you have the more you have the cover as othervise bombers will reduce your indsutry destroy infrastructure and your trops will loose supplies.

Now i migth have recommended good combinations but i lack time hopefully someone else