The Fightin' Five is a Blackhawk-style fighting group. The members are: Hank Hennesey, Tom-Tom, Irv the Nerve Haganah, Frenchy the Fox and Granite Gallero.
Their adventures and those of the back-up feature Peacemaker are continued in Peacemaker (Charlton, 1967 series).
The indicia of #41 (at least) reads "Fightin 5" not "Fightin Five."
There is a hiatus between #41 and #42. The later issues are all reprints.