An article in the January 1957 issue of Approach described the development leading to the APH-5 helmet. Among other things it stated that that the most promising helmet under development, the BBC-X2, would incorporate a new helmet shape plus a novel means of providing individually moulded fits. Using an epoxy resin for the energy absorption material, non-technical personnel at the squadron level would be able to make individual head moulds which would be placed in the new shell, covered with a thin, comfort layer of sponge rubber with an inner lining of chamois. The visor would retract between the outer shell and the energy absorption layer. The article further mentioned that the BBC-X2 was a joint development between the US Navy and the US Air Force, and that the helmet was intended eventually as a replacement for the APH-5.

Although it is unmarked, it is highly likely that the helmet in the accompanying pictures is the BBC-X2. It shows clear signs of having been made by hand, rough edges, comms cord cover fitted with standard rivets, and it boasts all the features described above.

Basically the same series of pictures but this time they show the helmet with its visor in down position. Photos are copyright Bloodhound.