I expect that we will soon see the Christian Right fulminating about how this extension of equal treatment to a non-Christian belief system somehow represents "oppression" of Christianity.
As an aside, I note that the article betrays ignorance in its final comment that "variations of the pentacle not accepted by Wiccans have been used in horror movies as a sign of the devil." The "inverse pentagram" (the "upside-down" version, with two points up and three points down) is the symbol of Satanism most commonly used by actual Satanists; the association is not a product of "horror movies". Contrary to common belief, Wicca and Satanism have very little in common, though they both owe a great (and seldom-acknowledged) debt to Aleister Crowley.
While the official recognition of the Wiccan symbol is welcome, it seems to me that the whole idea of an official roster of acceptable symbols is incoherent. Given the tremendous religious diversity of the US, there will always be new cases like this brought by people whose belief systems are not represented on the list. (Also, there is a symbol on the list for atheism, which is not a belief system.) For that matter, there are Satanists in the US armed forces too, and yet the inverse pentagram is not on the list. I can't wait to see how the Christian Right will foam up when someone files a lawsuit to include that.