Cards and board games
Sorry you don't have much faith in us folks from fly over land. I keep in touch with a goodly number of my old timer partners and while we may eventually lose in the long run, the other folks are gonna know theyv'e been in a tussle.They'll sure try, but there's no way our modern fighting force will hold out with that old tech. They aren't trained on it and have no experience with it. We don't have the numbers either. Also, they will be too busy acting as humanitarians.
I just don't have confidence we will resist.