U.S. President Barack Obama (L) takes part in an arrival ceremony with Polish President Bronislaw Komorowski at the Presidential Palace in Warsaw May 28, 2011. Obama will reaffirm on Saturday a U.S. commitment to Poland’s security with a deal to set up an air detachment, the White House said, meeting a key Polish request for “American boots on the ground”. REUTERS/Kevin Lamarque (POLAND – Tags: POLITICS MILITARY)