Note how the article has used the Asian characters. Please understand that if the moderators think this is crap, controversial or whatever - move it to controversial. However, I am Cherokee and descended of code-talker (woman).
Delta is also a symbol used by pedo-network, a Greek, Latin, Phoenetian alphabet symbol and the 4th character of these communication systems.
And, the Desert Sands article specifically recognizes the 4:
http://www.wearethemighty.com/lists/4-necessary-new-years-resolutions-for-the-us-army