I see your point entirely, Jean, but I believe the protocol here is that Speaker Boehner, 3rd in line to the throne, as it were, and apparently able to put out such invitations entirely on his own initiative, according to all accounts I have been reading lately, INVITED this pope, as Head of State (the Vatican State) to make this visit. INVITED. And assured The Vatican of complete security guaranteed by THIS country.
So We The People had no choice, upon the Pope accepting our gracious invitation, but to provide the security necessary. Over and out to the security experts, and if they deemed it in our national interest to supply Marine helicopters for his transportation, they rule.
Personally, I think it money well spent, especially considering a number of factors that came out really big: His Holiness takes the word of the scientists and fears global warming, Republican Catholics are now split on that subject and 3 fervent Catholics on the Supreme Court boycotted their Head of Church's appearance before the Congress, and it was, like it or not, the Leader of the Republican Party who set this whole thing in motion with his invitation! What a puzzlement! Personally, I think most Catholics will stick with the Pope and, in the long run, will vote Democratic. Win lose, win lose, win lose, WIN!