In The Comic Reader #27, July 1964, George Kashdan is credited with writing the Blackhawk fillers, per Nick Caputo.
Letters from Andrew Wallak, Sidney Barrett, Gary Lanoue, Murray Hovland, Danny Shanee, Jeff Moore, Barry Sabino, David Jones, William Foldman, Craig Russell (future comic artist), Mark McConnoughey, Bobby Rice, Kathleen Chadboure, Dennis Greco, Rodney Beck and Frank Alison.