'Regardless of the circumstances, we still get an American soldier back if ... held in captivity. Period. Full stop...'

"Period. Full stop."

Meaningless blather. See Linkmaster Smith, "Victor Davis Hanson Nails It":

Obama uses a host of emphatics (e.g., Period!, Let me be clear!, Make no mistake about it!) precisely because he seeks to accomplish in speech what he cannot do in fact.

And just after 2:00 minutes at the clip, from the president's press conference today in Warsaw: