A combined CCP/RU invasion route thru Alaska is the most likely threat axis to North America. Even that is highly unlikely.
That would be a very long supply line down through Canada and into the US.
The threat route is through Los Angeles, New York City, and Washington DC / Northern Virginia, and the border with Mexico. Communist China bought and paid for politicians such as Jao Bai-din, as well as korporate boards.
Why send even one soldier when the Uniparty will import illegal alien invaders on the taxpayers' dimes?