U.S. President Barack Obama (R) is welcomed by 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/Peter Andrews (POLAND – Tags: POLITICS MILITARY)