I was totally confused there for awhile. But the mention of "hole" reminded me of a place I had totally forgotten about that is fairly close to where I live. I hope I'm not hijacking here but this place is a trip, and it does have to do with holes. I have only been there once and although I'm no expert he had a bunch of helmets, I don't know what they are called but he also had the helmet's with the hinged ear covers... You might want to check this place out, hell you can pick up a cup of radiation while you are at it. Los Alamos Sales Company - Home Page
The ''Big Hole'' is on an military area and protectect by an huge fence.
Gonne look there soon. i hope i can get there .