The wildest part of Fallout lore is realizing The Fatman isn’t that outlandish because the US really experimented with a nuclear-warhead fired from a giant RPG.
It was more like an artillery piece you’d give to a motor team than a shoulder fired weapon, but still wild.
Austin on shoddycast actually covered the mini nukes some time back. it’s a fun watch, though he does have a tendency to swear like crazy.
