One potential issue could be some sort of alien defensive system that neutralizes nuclear bombs, although if the aliens can deactivate nukes, they should have no problems deactivating those Xcom commandos boarding their ship.
Imagining the prophet Jonah boarding his ship in Jaffa just days before he was cast into the sea and swallowed by a whale, I piled into the Israeli girls' car and continued my strange little pilgrimage.
Had Triumph vacationers looked up information about the cruise ship through those two agencies before boarding, they would have found mostly clean marks and few red flags.