G.A. Heath wrote:The truth of the matter is we are not sure how people get added to the terrorist watch list. It could be anything from sneezing to actually getting convicted of terrorism. The fact of the matter is the contents of the list are secret and how the contents are added is secret.
This is certainly a factual statement.
And, to address what the OP asked, please remember the Department of Homeland Security training document from some time back talking about veterans coming back from the war potentially being "right wing terrorists", or words very close to that effect. So, while no one can substantially say that this HAS occurred, it is certainly not out of the realm of possibility, at least at this point.