I think he kind of defeated his own point. He gave his full name, his rank, and the years he served. The Marine corp is the smallest branch of the military so it would be pretty easy to find out exactly who he is, where he lives, and the rest of his personal information. He also mentioned that he has an AR-15 so he essentially notified the US government, and the rest of the world via the Internet.
As for me... What guns? I don't own any guns!