FYI:
According to MSA Gallet the LH helmets has the following spec:
Protection against impact:
- MIL-DTL-87174/A
Protection against perforation of the shell and outer visor:
- MIL-DTL-87174/A
Resistance of the retention system in accordance with standards:
- EN 966:1996
Audio protection:
Passive attenuation of LH Helmet – ANSI S312.42 1995 (MIRE method)
Heat and fire protection: flame retardant outside coating.
The visors are in accordance with standard MIL-V-43511B and EN 1836:1997.
That may not count as an approval stamp - but it can't be that bad...
RD