What is the primary function of the chinstrap on the HGU-56/P helmet?

The primary function of the chinstrap on the HGU-56/P helmet is to assist in holding the helmet securely. A well-fitted helmet is crucial for aviation safety, as it helps to ensure that the helmet remains in place during flight and protects the head in case of turbulence or a sudden maneuver. The chinstrap secures the helmet firmly under the chin, preventing it from slipping off or becoming dislodged when subjected to various forces, such as those experienced during flight.

While other features of the helmet may contribute to its overall functionality, the chinstrap's main purpose is to ensure that the helmet provides optimal protection and comfort by keeping it stable on the wearer's head.