Lots of folks ‘invite’ the President & First Lady to their wedding, just to get the lovely ‘Best Wishes on your Special Day’ card they send you in return.
I sent an invitation to the White House in 2006 when I got married, and while I never expected W & Laura to show up, I did get a lovely card in reply.
I have a hard time believing 2 Army captains would invite Obama for anything other than the free card!
Bet the emperor never sends these two anything.