awhmm,, ferret fang... I think you're talking about the US SPECTRUM WARRIOR Helmet. Now that one will stop a 9mm. But deffinitely not the 5.56mm ammunition nor the 7.76mm... it will go through the helmet and hit the inside of it and stop. My cousin is in the US Infantry and during training the captain or some guy demonstated the power of the M16A2's 5.56mm round and the ammunition just went right through the "PASGT" helmet and out.... it didn't even slow the ammo. But my dad tried shooting the spectrum Warrior helmet with a 9mm and a .45 kal and it didn't go through it. It stoped in the first layer (that was pretty cool though.) But I heard the 5.56mm will go through it. The Spectrum helmet is used by the cops and SWAT Teams because most of the bank robbers and bus jackers and those criminals only use a small fire arms like 9mms and 45 cal.
The US Intercepter body armor, which is provided to all the US Marines, and Army infantry men, with the carbon ceramic or carbo something plate will stop a huge AK 47 rounds (7.76mm.) I watched it in the history channel... the old mail call guy really shot the AK-47 round, 3 rounds only a little bitty black spot on the vest......... holy crap huh?
Talking about the mail call, how many of you guyz saw the more "updated" land warrior system?? It got dang small you know? The first one they introduced like 3,4 years ago was something like 70 pounds all together?? Now it is only 12.5 pounds and all those computer systems and the battery systems are just in a 2, 10cm box. I especially loved that flip up & down eye monitor stuff... that thing got more small and with a higher resolution,,, the riffle's camera, infrared scope and all those stuffs got smaller to... just with a flip of a button, the camera image will go into your eye monitor.. I hope I'll have one of those by the time I graduate from college or the military academy... oh sorry, the post is going off topic... I apologize.