Are you talking about the Metzelers or the Michelins?
Metzelers.
Off topic: In historical military terminology, Warrant = assigned to perform a specific job--but as a mustang, I enjoyed your chosen definition.
That was a quote I saw written in scroll over the desk of a long since retired mentor many years ago. I enjoy it as well, though I make no personal claim as to it being my work.
Para 3.9 of the most current (11 DEC 2007) edition of DA PAM 600-3 provides the following definition:
"The Army WO is a self aware and adaptive technical expert, combat leader, trainer, and advisor. Through progressive
levels of expertise in assignments, training, and education, the WO administers, manages, maintains, operates, and
integrates Army systems and equipment across the full spectrum of Army operations. WOs are innovative integrators
of emerging technologies, dynamic teachers, confident warfighters, and developers of specialized teams of Soldiers.
They support a wide range of Army missions throughout their career. WOs in the Army are accessed with specific
levels of technical ability. They refine their technical expertise and develop their leadership and management skills
through tiered progressive assignment and education."
The publication goes on to define each WO rank individually.