It's a provocative headline.
A more reasonable statement of the army standing orders / Rules of Engagement would be:
> The military has authorization to counter-attack an *invading force* without waiting for further approval from the command chain
I've emphasized invading force – it's not a general free-for-all fire-at-will.This is a standing order which dates back to 1952, and hasn't been created as a response to the recent aggressive posturing.
The headline explicitly mentions an invasion, and the whole debate is within the context of potential US invasion of Greenland, so I dont see what makes this headline "provocative".
Provocative is a stretch. A year ago a Danish soldier who responded to an ambiguous situation involving US bases that might be real or might be an exercise would have been court martialed and probably not able to justify their actions with this law despite it being on the books. The reminder is an emphasis that the US can be presumed to be such an invading force.