[EAS] Updating statement of requirements

[Sean Donelan]

On Wed, 18 Aug 2021, Adrienne Abbott wrote:
 If it comes down to a National-level EAS activation, the "Doomsday Scenario"
 of an EMP or nuclear missile attack, most radio and TV stations will be off
 the air, along with all the other noise generators which currently pollute
 the radio-sphere. The propagation of the PEP signals from their unstaffed,
 hermetically-sealed, automated 10 KW AM transmitters will probably be pretty
 clean.

As you know, the AM PEPs were originally a tertiary (3rd) backup channel. 
After the end of the Cold War, budget cuts eliminated the previous primary 
and secondary channels.  The AM PEPs weren't supposed to be the sole 
source.

We shouldn't eliminate the AM PEP backup option. We need a combination 
of independent distribution channels for resiliance, and both local and 
national sources.