THE U.S. MILITARY ACADEMY AT WEST POINT
'(<a href="http://www.j-archive.com/media/2006-03-02_J_24.jpg" target="_blank">Jon of the Clue Crew reports from in front of a military exercise.</a>)  A shortage of blue cloth led to uniforms of a different color & to this 3-word term for <a href="http://www.j-archive.com/media/2006-03-02_J_24a.jpg" target="_blank">the corps of cadets</a>'
the long grey line