Sioux.
 
Does this look familiar? Chances are you have watched more than a few episodes of M*A*S*H. The versatile Sioux helicopter has served in many military and civilian roles. Photo details: Canon 40D, ISO 100, 1/640th second exposure with a Canon EF 70-200mm IS USM lens @ f-6.3.

 Image taken January 17th 2009