Complete hardware kit for the attachment of a retention assembly to the helmet shell. The snap Retention Assembly version is the latest retention. Colour- Black.Retention Assembly, HGU-56/P BlackFeatures Provides same level of protection as the Double-D-Ring version. Fast and easy method of donning and doffing the helmet. D-Ring adjustment on one end and a snap fastener on the other. Others P/N:D9303-1