The coiled snake-god Mehen protects RA through his journey into darkness/underworld.
Depicted by Ouroboros, the snake that eats itself.
Ra represents the idea of Truth
If the NSA is the protective snake
Who is Ra, who is seeking truth?
Who does Ra need to be protected from as he journeys into the underworld?
Fun fact: Kek was called the "raiser up of the light"
If light = Ra = Truth
then Kek is raising up the truth
and Mehen is protecting the Truth as it's raised