This helmet is a "DH-151 modifiziert PA-594-BAMF 2", basically a DH-151 shell fitted with "off the shelf" HGU-55 components. Oxygen mask is a MBU/5-P, connected to the helmet with "J" bayonets.

This assembly was an interim solution adopted while dismissing the Gueneau 316, in order to provide pilots with lightweight helmets - before the introduction of the HGU-55 - using components already available.