B-17 with exotic painting

I share with you some photos of a Boeing B-17 bomber with an exotic and unusual camouflage. Does anyone know if this plane entered service and what the function of this painting? I count on your visit.

http://aviacaoemfloripa.blogspot.com.br/2011/01/boeing-b-17-flying-fortress-spotted-cow.html

Best Regards.

http://www.warrelics.eu/forum/aviation-history/spotted-cow-b17-406780/

https://en.wikipedia.org/wiki/Judas_goat

I knew about the assembly ships, also heard them called rally planes. Didn’t know about the Judas Goat term, very appropriate. BTW, we had some WWII bombers at a local airport this past weekend. It included the world’s last airworthy B-24, named Witchcraft.