Can you please point to any govt document that lists veterans as "threats" to Homeland Security? Or Tea Party members?
Or are you buying into the rhetoric that was about as truthful as Death Panels in the Affordable Care Act?
The actual "warning" was about violent, radical. extremists militia type groups trying to recruit returning vets into their fold and similar warnings about such activities have been issued routinely since the OKC bombing and the center of that action being on the shoulders of two former Army who turned to the dark side.
Use a search engine and look up that issue at Ft Bragg alone and you will find articles dating back to the mid 90's about the Klan and other groups actively targeting active military and vets for recruitment.
www.reuters.com/article/2012/08/21/usa-wisconsin-shooting-army-idUSL2E8JHO6K20120821[/URL]
http://articles.latimes.com/1996-02-06/news/mn-32736_1_hate-groups
The military has recognized this problem since the mid 80's, when Ronald Reagan's Sec of Defense, Caspar Weinberger issued directives that those military members who were part of racist, violently radical, etc. groups should not be accepted for enlistment and those who bore indicia (tattoos or the like) of such membership should be discharged.
Hell, Weinberger even noted that many groups like the Klan, Skinheads, etc. were urging their members not to go public with their beliefs and not to get tattooed or otherwise give away their stances, just so they could enter the military to get the training to help advance their cause down the road. BTW, there's also plenty of evidence that the Crips, Bloods and other Gangs have done the same thing. (Hell, when I was living in L.A. it turned out that there were 5 or 6 cops on the force, most of whom had first served in the military, who were basically "double agents" working for their old crips and bloods leaders.)
