Why: Historical location, The 'Lion of Waterloo' in the background, people climbin to the lion watching the flight-formation (actually I was there that day)
But: The special markings of '25 years' are applied in, I think 2001, so it means that helicopter was at the time of that picture, 9 years flying around with that marking. Don't know if they changed it to 30 years in 2011 ...
You don't see takeoffs like that at LAS all too often. I browse the LAS photos on a regular basis and just one that was recently added impressed me as it's not the typical LAS night shot taken from an a/c on approach to or departing from LAS:
I like how the MGM Grand and the buildings of CityCenter are lit up providing an almost otherworldly background. It's an interesting photo of parts of the Vegas Strip as the only way a shot of the MGM Grand with the buildings of CityCenter in the background is possible is from LAS.