What is the purpose of using a chest strap during ejection?

The purpose of using a chest strap during ejection is primarily to ensure stability during the ejection process. When an aircrew member ejects from an aircraft, the forces involved can be significant, and securing the body with a chest strap helps to stabilize the individual within the ejection seat. This stabilization is crucial for maintaining control over the ejection seat and ensuring that the aircrew member can effectively manage their descent and parachute deployment. Proper restraint helps to mitigate the risk of unnecessary injury or disorientation caused by the rapid acceleration and deceleration experienced during the ejection sequence.