President Harry S. Truman delivers an address while visiting San Juan, Puerto Rico. Behind the President (from left to right): Colonel Robert B. Landry, Air Force Aide to the President; Honorable Julius A. Krug, Secretary of the Interior; Honorable Jesus T. Pinero, Governor of Puerto Rico; Honorable Luis Munoz Marin, President of the Puerto Rican Senate; Vice-Admiral Daniel E. Barbey, Commander Caribbean Sea Frontier; Major General Harry H. Vaughan, Army Aide to the President, Captain Robert L. Dennison, Naval Aide to the President. The speech took place at the San Juan Naval Air Station.