Humm, the Civilian Pilot Training Program was not GA? GA planes and instructors? The Civil Air Patrol was not GA? GA planes and pilots? One of the reasons CAP was formed was because the Army Air Corps wanted to ban GA flying. That never happened.
On 8 December 1941, the day after Pearl Harbor, all general aviation flying was banned, The ban was lifted 2 days later. There were restrictions on flying during WWII but general aviation was very active.
I knew a guy that did coastal patrol in his personal airplane during WWII for the Civil Air Patrol. He was a civilian pilot, his plane was a personally owned GA airplane.