The Howard League for Penal Reform thinks that prison officers should have degrees. Criminology and sociology are believed to be suitable subjects.
As someone who actually has a sociology degree, I can tell the Howard League that it would be as much use in a prison as a GCSE in tourism. It's one thing to know something about the dynamics of incarceration and to be able to speculate on whether deviance is functional for society. It's quite another to face down some badass son-of-a-b***h on a landing when he's coming at you with a makeshift blade. No textbook will save you then. Unless you're using it as some kind of shield.