Let's say my country has 3 offensive allies who have 400k troops each and 0 jets each. If he attacks with 150k jets and 0 troops, will his offensive allies help him out at all? And if so, will his offensive allies lose troops?

If the allies do lose troops, then what if his allies each have 400k troops and 200k jets and he attacks with 150k jets? Will the game then just take from the allies' jets and leave the troops alone?

If they don't lose troops, then that means you're doubling your offensive force while not increasing your military losses or your allies' military losses, right?

Off and def allies are counted on points and not 1 specific military type as far as I know

ie you have only turrets and he has only troops but it still works, same for troops and jets etc

I believe the specific type used to matter and now it does not. I could be mistaken on that though.

What these guys said, it's based only on points. So if he attacks with all jets, and you only have troops/tanks you still aid him, and you still lose units.