Assuming that the intelligence gathering done on Greenland is a 24/7, there are likely only about 50 on duty at any one time.
I wonder how many (if any) have Arctic training. They will be mainly EW operators who generally don’t do much infantry training after basic. Although they will have to keep their weapons training up twice a year.
America has bought territory from Denmark and others in the past, long before NATO existed. Trump is picking up where America left off before the world wars. He is restoring his country whilst our politicians give ours away.