What is Leadership?

We tend to develop our concepts of leadership from the context in which we operate.  For most of us in the UK that means the public sector, NHS, Civil Service and local government, or the corporate sector such as financial institutions, retail etc. (less so nowadays, regrettably, from manufacturing or engineering).  This view is supported by the articles one sees in the various journals from, for example, the CIPD or the ILM.  Leadership is generally focused on measures like the bottom line and while this is important it tends to neglect the ethics and stewardship dimension of leadership.
Perhaps this approach to leadership is particularly British and corporate sector.  But there are other sources of leadership concepts which we often ignore and are more akin to the leader as a human motivator and example of sound technical judgement  whom followers can look up to and be inspired by to achieve.  One such source is, of course, the military of whom the conventional gurus of leadership often have a fairly dismissive or even sneering attitude.  This is odd because leadership in the military is so important when people are being asked to go in harm's way and often put their lives on the line.  After all it was General Norman Norman Schwarzkopf who said "Leadership is the art of getting ordinary people to do extraordinary things willingly", a more apt definition is hard to imagine.
I recently came across an article by Lt Colonel Matt Joganich of the US Airforce, What is Leadership, which spelled out his understanding of what leadership was.  I was much struck by its thoughtfulness and focus on the human side of leadership and the need for a leader to take care of his or her people.