How accurate was Full Metal Jacket's boot camp scene?

[Toome]

As an officer, I did not go through a "boot camp." However, I was young and dumb enough to volunteer for RANGER School, and whenever I have nightmares, I see a RANGER Instructor named "Swackhammer."

Ranger Class 10-81: "Our souls are sold to the Black and Gold! RANGERS LEAD THE WAY!"