Writer revision from S. M. Regi to ? by Craig Delich 2013-12-26. The Who's Who indicates that S. M. Regi was a pen-name sometimes used by Jerry Iger, but also by others as a house by-line. It further indicates that Jerry Iger did not write this feature, but that Alex Blum, under this pen-name or by-line, did draw the strip.
This feature was created by Manning de Villeneuve Lee, an accomplished fine artist and book illustrator who specialized in historical subjects. His by-line only appears on the first story in #16....after that, the strip was signed "Duane Byrd Monroe", a pen name for which no reference can be found.
The Who's Who lists Campbell as writer and artist in 1940-41.......Lee (called Lee Manning in the Who's Who) wrote and drew the strip in 1940, and Henry Taylor drew the strip in 1941. I'll leave it to other writer/art experts that have access to all the stories (from Smash #2-24) to determine who did what stories story and artwise.
Will Eisner created the Espionage feature, and Will Erwin was a pen name used by Will Eisner (Erwin was Eisner's middle name) until he left the feature at the end of 1940. It also became a house by-line as well for future writers.