I've been scouring the internal job board, which is just a version of the external board with extra internal information attached, and all the promising jobs seem to have a notice plastered on them that says:
"THIS NOTICE IS BEING FILED AS A RESULT OF THE FILING OF AN APPLICATION FOR PERMANENT ALIEN LABOR CERTIFICATION. ANY PERSON MAY PROVIDE DOCUMENTARY EVIDENCE BEARING ON THE APPLICATION TO THE REGIONAL CERTIFYING OFFICER OF THE U.S. DEPARTMENT OF LABOR."
When I apply for them I never hear anything back.
I don't really know what that notice means, but I am a citizen and really want (and am more than qualified for) the jobs they are posted under.