It's not, and that's what the problem is as I see it. The LOA apparently exists, but Notams/IFR Sup/VFR Sup don't list it as such. So, how is the average Joe supposed to find out about it?
http://skyvector.com/#30-24-3-3633-3081
I guess my question would be why would the typical Average Joe need all the information in the LOA, for example Helo course rules in and out of MCAS Miramar? We have ATC to keep an eye out for us and keep IMC seperation, and VMC we should all be maintaining a good lookout anyway. If you talk to someone, whether it be SOCAL approach or a specific tower, and they tell you to remain clear for whatever reason what does it hurt to remain clear?