Pulp Parade #261: It’s rainbow man!

Pulp Parade #260: Believe it or not, LSD would not be invented for another twelve years
Pulp Parade #262: Didn't think they'd actually shoot back

This is Amazing Stories for November 1942, cover by Robert Gibson Jones. The ISFDB entry for this issue is here. I found the version of the cover above at Pulp Covers. There is a smaller, brighter version at Galactic Central.

You can download and read the entire issue from the Internet Archive.