This FBI video from 1969 called “Shooting for Survival” illustrates how much has changed in the world of training. They are shooting what appears to be S&W .38 Special revolvers in the first few scenes and are shooting one-handed. The only two-handed grip you see, for the most part, is a tea-cup.
That said, shooting from cover and concealment is as important now as it was then. They do a good job of showing the effective use of cover and the importance of keeping your limbs covered. They also show how to protect yourself from ricochets.
H/T Packing Pretty