We had live fire in training in 65, we were crawling through a obstacle course with a machine gun firing over us
What no dynamite going off in those fox holes you crawled past? :) Yes we did real Grenades as well even rifle grenades launched from an M1 Garand, fired from shoulder, man that hurt.
Oh, I forgot about the explosions and the warnings NOT to climb into one of those fox holes. :)
Of course it was not until I got to Viet Nam that the real OJT took place.