In my experience aboard 5 carriers the wings are folded upon landing.
and unfolded on the catapult just before launch. I can remember only a
few occasions seeing aircraft on the hangar with the wings unfolded.
Usally and A-6 on jacks doing some sort of maint. check.

Would not know about WW ll.

I was in the USN from ' 71-' 91. My 25 year old son has been on active
duty for the last 7 years. He is a STG2(SW).

bd popeye