Formulate an answer to this elaborate question: Rear Admiral (UH) Raymond A. Spicer, United States Navy, is the former director of the White House Military Office and reported as Deputy Assistant to the President and Director, White House Military Office in March 2007, and was succeeded by which American politician and member of the Democratic Party who served as the Director of the White House Military Office from January to May 2009, as the 17th United States Secretary of the Army?
A:
Louis Caldera