Wery well, and what for are this exercise?

[link to unesdoc.unesco.org]

[link to www.fema.gov]

Why FEMA posted a piece in his statement: "... During the test, viewers will hear a message indicating that “This is a test.” Although the National EAS Test may resemble the periodic, monthly EAS tests that most Americans are already familiar with, there will be some differences in what viewers will see and hear, which is one reason for conducting a national EAS test. The audio message will be the same for all EAS Participants; however, due to limitations in the EAS, the video test message scroll may not be the same or indicate that “This is a test.” This is due to the use of a “live” national code – the same code that would be used in an actual emergency. In addition, the background image that appears on video screens during an alert may indicate that “This is a test,” but in some instances there might not be an image at all...." ?

Not too much of this as a coincidence?