The on-sale date is from the publication date recorded in the Catalog of Copyright Entries, Part 2, Periodicals, 1943, New Series, Vol. 38, No. 4.
Pencil credits from Sid Hamburg via Shaun Clancy through the Facebook page Comics History Exchange. Hamburg was a neighbor to Mac Raboy and was hired by Raboy as a background artist assistant for two years. On this cover, Hamburg drew the soldiers and Raboy drew Captain Marvel Jr. Hamburg got to keep the original art for this cover, later sold by his family in 2012. (24 May 2014).
Some information and synopsis added by Craig Delich 4-4-09.
Some info and synopsis added by Craig Delich 4-10-09.