During Greco's tenure as Assistant Secretary, the United States Navy and United States Marine Corps continued to fight the Global War on Terrorism, responded to the earthquake and tsunami in Indonesia and the Pacific, and responded to Hurricane Katrina.
During Greco's tenure as Assistant Secretary, the United States Navy and United States Marine Corps remained actively engaged in Iraqi Freedom, Enduring Freedom, and elsewhere in the Global War on Terror. In addition, the Navy and Marine Corps responded to the earthquake and tsunami in southeast Asia, the earthquake in Pakistan and India, and Hurricane Katrina.