National Park Service

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.

General Harry H. Vaughan (left), Military Aide to President Harry S. Truman, in his office in the White House. With him is Cornelius J. Mara, Assistant Military Aide to President Truman.

General Harry H. Vaughan, Military Aide to President Harry S. Truman, in his office at the White House.

General Harry H. Vaughan (left), Military Aide to President Harry S. Truman, in his office in the White House. With him is Cornelius J. Mara, Assistant Military Aide to President Truman.

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

The office of General Harry H. Vaughan, Military Aide to the President, at the White House.

General Harry H. Vaughan, Military Aide to President Harry S. Truman, in his office at the White House.

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