Discussion: HR as a Competitive Advantage

What is your organizations chief competitive advantage?
How has your organization positioned itself to lead its market segment?
What roles does the human resource (the people, not the practices) play in establishing this advantage?
For those of you in military units, you may want to approach this topic by comparing similar units in which you served. In other words, what made one squadron, ship, battalion, etc., stand out? How did the units personnel contribute to that differentiation?
Support your post with additional information from at least two reputable sources (library and/or Web-based). Cite your sources. Bring in your own personal experiences, as applicable.