What technique is almost always used when lifting a casualty on a litter?

The technique of squatting and lifting is recommended for safely lifting a casualty on a litter because it utilizes the strength of your legs, which are more powerful than your back. This method helps to prevent injury to the lifters while allowing for a controlled and stable lift. By squatting, you lower your center of gravity, which provides a stronger base of support, making it easier to lift and carry the litter without straining the back. This technique also allows for better coordination among team members who may be assisting in the lift.

In contrast, methods such as bending and twisting can lead to improper lifting mechanics, increasing the risk of injury to the lifters. Pulling quickly can create instability and may not provide proper support to the casualty, while lifting directly overhead is generally not practical for lifting a casualty on a litter, as it can compromise both the lift and the safety of the casualty. Thus, squatting and lifting stands out as the most effective and safe technique for this situation.