What is "chinooks"

Usage examples of "chinooks".

On the pan were Chinooks and Pumas and a couple of aircrew mincing around on them.

James and I ran around the perimeter fence, past Chinooks and aircrew who were busy licking ice creams.

Pumas or Chinooks, depending on where the target is and where we can get the aircraft in, then straight in and take it out, grab the hostages, into the aircraft and back over.