The Controversy of a Potential Hafnium Bomb
And it's that attitude that, in a perverse sense*, helped hold the enormous game of chicken in a steady state until the collapse of the USSR. Adopting the doctrine that any tactical deployment of nukes would be functionally equivalent to a strategic first strike, in essence, stabilized the European theater against border brinksmanship.
The Soviet Union made it quite clear that were NATO to use nuclear weapons on the battlefield it would retaliate with a strategic nuclear launch against the West.
*(though no more perverse than any other aspect of post-Kissinger nuclear diplomacy)