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From the US Military Packaging Division...

A continuously sealed metal barrier has proven to be very effective in preventing EM/HPM energy from reaching susceptible electronic or explosive components. Exterior packaging fabricated from plastic, wood or other fibre materials provides almost no protection form EM/HPM (electro-magnetic (pulse) and high power microwave) threats. The metal enclosure can be very thin provided there are no openings (tears, pin holes, doors, incomplete seams) that would allow microwaves to enter. Sealed barrier bags that incorporate a thin layer of aluminum foil and are primarily used to provide water vapor proof protection to an item, can add a great deal of resistance to EM/HPM penetration.

A number of cylindrical and rectangular steel containers have been developed by the Packaging Division for a wide range of munitions, weapon systems and associated components. The cylindrical containers are end opening and the rectangular containers are top opening. All the containers have synthetic rubber gaskets that allow them to maintain a +3 psi environmental seal to the outside environment. The containers are constructed using seam welding to provide for continuous metal contact on all surfaces of the body assembly. The cover openings have been held to a minimum and the sealing gaskets positioned in a manner to allow overlapping metal parts to add additional protection to these areas. Microwaves are very adept at bouncing around and working their way into even the smallest opening. Tests of the cylindrical and rectangular steel containers used by this organization have demonstrated a high level of protection in preventing EM/HPM energy from entering the container.

The key is to use a metal enclosure and eliminate or minimize any openings. Where openings are needed they should be surrounded to the greatest extent possible by continuous metal and in the case of a gasket, metal sheathing or mesh can be placed around the elastomer material or conductive metal molded into the gasket. The closer the surrounding container comes to a continuous metal skin the more protection that will be provided.

Note: In the original on the site, several words were spelled wonky, like vapour, aluminium, and so on. This information obviously wasn't cut/pasted from any us manual. It might have been copied manually, then again, it could be made up. I can't track down the original document, nor can I locate any such unit. I wouldn't expect any military unit to call itself the "US Military" anything, they would tend to say US Army, US Navy, DOD, etc. but who knows, maybe that bit was lost in transcription too.
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