Early C-130, also look close and see 4 miniguns out the windows.... one of the first that would be called spectre to replace Puffs(c-47s mounted with miniguns shown above).
That may be the first test aircraft for what became the AC-130 gunship. Using Joe Baugher's site, s/n 54-1626 was converted to prototype AC-130A and is now at WPAFB museum.