Proving grounds

An unidentified young man (right) is being interviewed by an unidentified reporter (left)during a military demonstration at Aberdeen Proving Ground in Maryland.

President Harry S. Truman (first on right) descending a staircase at Aberdeen Proving Ground during a demonstration of military hardware. Behind Truman is Secretary of the Army Frank Pace. All others are unidentified.

President Harry S. Truman descending a staircase at Aberdeen Proving Ground in Maryland. Near the bottom of the stairs are President Truman (left) and Major General Edward MacMorland (right), Commanding Officer of Aberdeen Proving Ground. Directly behind Truman are Secretary of the Army Frank Pace (left) and General J. Lawton Collins. All others are unidentified.

Demonstration of military hardware during President Harry S. Truman's visit to Aberdeen Proving Ground in Maryland.

President Harry S. Truman watching a demonstration of military hardware with other dignitaries, (unidentified) at Aberdeen Proving Ground in Maryland. Front row, left to right: Major General Edward MacMorland, President Truman, and General J. Lawton Collins. Seated in the second row, right, is Secretary of the Army Frank Pace. All others are unidentified.

President Harry S. Truman (in foreground, right) and unidentified military officers throwing a switch during a demonstration of military hardware at Aberdeen Proving Ground in Maryland.

Unidentified persons conducting and participating in an interview during a military demonstration at Aberdeen Proving Ground in Maryland.

President Harry S. Truman (in foreground) with unidentified persons throwing a switch during a demonstration of military hardware at Aberdeen Proving Ground in Maryland.