From 1941 to 1947 there was an entity called "US Army Air Forces" that many people forget about. During this period the US Army Air Corps was a division of the US Army Air Forces. And the media often changed Forces to Force in their stories.
I think sometimes this contributes to the confusion regarding Air Corps vs Air Force.
https://en.wikipedia.org/wiki/United_States_Army_Air_Corps
http://www.aafha.org/air-corps-or-air-forces.html