Which situation requires immediate application of direct pressure by a Hospital Corpsman?

In a situation involving uncontrolled bleeding, the immediate application of direct pressure is critical. When there is uncontrolled bleeding, it is essential to stop or minimize blood loss to prevent shock or further complications. Direct pressure helps to constrict blood vessels and promotes clotting at the site of the injury, which is vital for stabilizing the patient's condition and maintaining adequate blood flow throughout the body.

The other situations, such as minor cuts and scrapes, bruises, or swelling from a sprain, do not typically warrant immediate direct pressure. While they may require treatment, the urgency and potential for severe outcomes seen with uncontrolled bleeding make it unique in its need for immediate intervention.