In a nuclear battlefield, the concentration of forces into a spearhead would present a perfect target for the employment of tactical nuclear weapons. A single well-placed weapon could break up the attacking forces before they even had time to properly prepare, causing enough casualties to make them ineffective even in the defence.
This is the type of equipment it was expected an infantryman attacking an irradiated zone might need to push forwards after the employment of a tactical nuke on an enemy formation.
https://taskandpurpose.com/tech-tactics/army-soldier-future-1959-video/
Jeep mounted Davy Crockett tactical nuke:
I was gonna say. Keep your M14. Gimme a stock for the 1911 or whatever pistol they were using back then and and somewhere to place a bayonet. At least I’ll know it will fire when needed.