Washington (CNN) – Busloads of World War II veterans, many in wheelchairs, broke past a barricade Tuesday morning to cross into the World War II Memorial, as onlookers applauded and a man playing the bagpipes led the way.

Moments earlier, a few Republican members of Congress had removed a section of the black gates that surrounded the site, allowing a line of veterans to roll past security officers, who willingly stood aside....