Today I received a letter in the mail saying that I have received my congressman's "Principal Alternate" nomination. I'm happy with this, but a little confused as to what it means...from what I understand, I am the next-in-line if the principal nominee is disqualified or chooses to attend a different academy--is this correct? And if they do choose to go, then is that it for me? I've searched, but I've found limited information on principal alternate nominees, aside from learning that its not very common. I'm in California, if that makes a difference. Any insight?