On sale date found in house ad in Justice League of America #149.
The colorist credit is from the About the Creators text article in this issue. "Bob LeRose assembled the covers."
The picture of Uncle Sam in the background is "based on the classic World War I poster by James Montgomery Flagg."
Same picture as the cover, only in black and white and there's no picture of Uncle Sam. Located on the inside front cover.
Per the opening paragraph, this part of the story takes place on June 10th 1942, on the island of Midway during World War II.
Article and brief biographies on the creators. Includes pictures of Joe Orlando, Gerry Conway, and Jose Luis Garcia-Lopez. Located on the inside back cover.
A picture of Superman and Wonder Woman battling in Washington D.C. Located on the back cover (but not wraparound).
Colorist credit from the About the Creators text article (where it says that Tatjana Wood "colored the covers"; plural).