He was Killed in Action in the Luzon Islands, 7 Apr 1945 and is buried in Manila American Cemetery Philippines,  Plot A Row 2 

During the Morotai Campaign in Sept.1944 he was promoted successively from Private first class to sergeant and staff sergeant. His Leyte performance won him another promotion to technical sergeant. And then he was commissioned to second lieutenant. He was a veteran of fighting at Saidor, Aitape, Morotai and Leyte.

He earned the title of "The Human Mortar" because of his proficiency with grenades. He threw with such accuracy and for such distances he became the official grenade thrower for the company. Whenever any part of the unit ran into difficulty the commander officer sent for Chambers and a case of grenades. He threw so many that he became quite literally a human artillery piece. A combat film that was shown in a theater in New Castle showed (Buck) Chambers hurling hand grenades at Japs in the Philippines. 

Before entering service Buck was well known in local amateur boxing circles in the New Castle area.