I am in the USN and run a classified network on board the USS Kitty Hawk. The requirements are fairly simple. No active USB (just disable the controllers) and no CD Burners. Floppy drives are fine. The hard drive must be in a removeable tray. You should also disable the NIC unless they tell you that they have a classified LAN that the machines are going to be put on. As for the stickers, those should be provided by the DoD. They have specific stickers that they are required to use.
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I am in the USN and run a classified network on board the USS Kitty Hawk. The requirements are fairly simple. No active USB (just disable the controllers) and no CD Burners. Floppy drives are fine. The hard drive must be in a removeable tray. You should also disable the NIC unless they tell you that they have a classified LAN that the machines are going to be put on. As for the stickers, those should be provided by the DoD. They have specific stickers that they are required to use.
Visual light takes up just a small segment of the electromagnetic spectrum. There are shorter wavelengths they can use to detect it.