Guys too old to be in the military, rounded up for a special squad in search of the art and antiquities that the Nazis looted from Europe or were planning to destroy. History, art, culture of conquered peoples, erased. That’s what the Monuments Men, led by George Clooney and Matt Damon and including Bill Murray, John Goodman and Bob Balaban, were trying to stop. This looks light and yet moving, weighty — Oscar worthy, even. Maybe? A true story, “The Monuments Men” opens in December.