I don't think there is any comparison between "prefab" letters   written by Greenpeace and the situation described here. In the case of the former, an effort is made to generate awareness and support, and the letters are OBVIOUSLY pre-printed and the elected officials   who receive them are well aware of their point of origin. I used to work for Greenpeace, and these sorts of letters are standardized among many activist organizations.

In the latter case, these letters were sent with the full intention of conveying the sentiments of those whose names were signed to them, even though they themselves did not write them. In other words, deception of the highest order. Deception may not have been the intent. But what did they think would happen when this   came to light? Perhaps the commander thought no news editors would put two and two together. The letter should have been clearly worded to state that this was a newsletter reproduced en masse, and not signed by individuals.