Never said they were, the point was about rear access ramps.My memory might not be what it used to be but German military and American coastguard helicopters weren’t in general used in the British army back in the seventies.
I flew, at times frequently, in Wessex, Puma and Scout helicopters. All of them were either RAF or AAC aircraft.
The couple of trips in an American army Chinook were familiarisation flights while on an exercise down on Salisbury Plain and as such, a one off event.
Presumably your flights were of a similar nature?
The original poster said American and said 1970's.
The Chinook did not enter UK service till the 80's.