Sorry, Eugene. Had to respond to this one.
Whatever else you may feel, the first movement of Union Jack has a hell of a lot of dancing in it! Balanchine takes classical steps from Highland and Scottish Country Dancing (which came from the French Court Dances in the first place) and spins them into amazing perspectives as only he could wreathed from the perspective of different regiments. It is devishly difficult Movement (not mention sophisticated, of course) and there are, at its conclusion, over 80 dancers on stage.
If you get the chance, see it, do. (Sadly it won't be in London as there is still no where large enough to hold it - short of a stadium, which would not be appropriate, see: floor, etc.)
The first movement of Union Jack has the thrill of the Tattoo from a wholly balletic perspective.