Zeppelin Frontman -- National Security Threat!?

2/10/2009 7:30 PM PST BY TMZ STAFF
This TSA agent was faced with one of the toughest decisions EVER -- fight the urge to approach his personal idol, Robert Plant, and ask for an autograph ... or leave his post, jeopardize our national security, and probably lose his job. Decisions, decisions...

Props to security at LAX -- this guy never left his spot.