NEW : U.S. troops did `` truly remarkable '' things in Iraq , Austin says . ( CNN ) -- `` Welcome home , '' Joint Chiefs chairman tells troops . Tuesday 's ceremony was the formal finale of the U.S. military mission in Iraq . The last combat soldiers left Baghdad on Wednesday and will leave by June 30.
NEW : U.S. troops did `` truly remarkable '' things in Iraq , Austin says . `` Welcome home , '' Joint Chiefs chairman tells troops . Tuesday 's ceremony was the formal finale of the U.S. military mission in Iraq . The last combat soldiers left Baghdad on Wednesday and will leave by June 30.