Same again,
A good place to start would be by reading 'Whirlwind' by James Clavell. A fairly accurate (or so I'm told) account of how Bristow managed to get their helicopters out of Iran after the maniacs took over the asylum in the late 1970's.
Don't bother reading 'Whirlwind'; it bears little or no resemblance to operation Sandstorm despite Clavell having interviewed many of the people involved. The best account is in Alan Bristow's 'autobiography'.