My favourite GA related story: he once wangled a visit to the site where Concord was being built, without telling anyone who he was, but one of the engineers got suspicious. Eventually he had to own up and confess he was the creator of "Thunderbirds".
The engineer gave him a quizzical look and said "Come with me." GA, seeing a cell and handcuffs in his immediate future, followed him to one of the design studios where the engineer opened a plan chest and took out some blueprints.
GA was amazed to see that in their spare time, the Concord team were working out how to make Thunderbird 2 fly!
R.I.P. You are officially forgiven for "Terrahawks".