I'm offended as an American that a date would be seen as something a person does for their nation, as a sign or patriotism. Do it for our nation? Not the nation I'm patriotic to - I want no part of a country where such a request would be tied to nation. Its a repulsive idea to me - to invoke nationalism as a reason someone should socialize, especially in anyway that could be considered related to romance and sex, which is what a "date" to a dance is. I would equate forcing, or even just pressuring, young women into such positions something seen in an evil dictatorship not in a democratic republic.
If Mila - or Justin, or Betty white or Scarlett - wants to accept a date or attend a function like a military (or any other type of) ball they are invited to, great. But it should in no way shape or form be even hinted at that their patriotism is even remotely at stake when considering attending or not.