Fig. 1.
Defense policy area: A indicates that the first defense mechanism will be activated; B indicates the second defense mechanism; C indicates that the third defense mechanism; D indicates that the fourth defense mechanism.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.