The Blackhawk characters are primarily associated with this time period, although during the New 52 reboot, the team was operating in the modern day as an elite covert military unit tasked with battling a terrorist group called Mother Machine.
In case you’re not familiar with Blackhawk, it was one of the earliest properties that would make up what would eventually comprise the DC Comics universe.
Both Arrow and The Flash have also featured a company called Blackhawk Security.
Outside of the comics, Blackhawk was a 15-part film serial in the early 1950s, and the characters also popped up in the animated Justice League series.