That's Rabbi Schacter on the left.
He died last week at the age of 95. Obit in the NYT:
The smoke was still rising as Rabbi Herschel Schacter rode through the gates of Buchenwald.It was April 11, 1945, and Gen. George S. Patton’s Third Army had liberated the concentration camp scarcely an hour before. Rabbi Schacter, who was attached to the Third Army’s VIII Corps, was the first Jewish chaplain to enter in its wake.