TripleA doesn't allow US ships to move in sea zone 121 while USA is not at war.
The rule say
"While not at war with Germany or Italy, the United States may end the movement of its sea units on the Europe map only in sea zones that are adjacent to U.S. territories, with one exception: U.S. warships (not transports) may also conduct long-range patrols into sea zone 102."
and Greenland is marked as US territory.