There were approximately 638 Chinooks registered in the US in 2009. There is no official information as to how many are registered in 2013.
374,161 FAA Registered Aircraft in USA
They were sent with the Chinooks when the RAF bought them, and the GPMG was not compatible with the weapons mounts on the Chinooks.
100000000
About 2.5 million.
2622
190 million
8000
at least 1000000
only 20
5 million
Traditionally Chinooks were not farmers. The land had to many trees growing in it. Chinooks hunted, fished and gathered roots and berries.
the chinooks celibrated potlaches