The Pentagon says the president's goal to slash another $400 billion from defense spending over the next 12 years cannot be done without cutting military forces and their ability to protect U.S. security.
Pentagon press secretary Geoff Morrell (moh-REHL') says Defense Secretary Robert Gates believes budget cuts must not be a math exercise. He says they must be done thoughtfully and by assessing national security threats.
He says officials must identify military missions the country is willing to go without.
Morrell says Pentagon leaders were told about the budget goal Tuesday and there will be a broad review to come up with options for President Barack Obama to consider.
He says the budget cuts would not take effect until the 2013 budget.