Outgoing Defense Secretary Robert M. Gates warned Sunday against sharply cutting the size and reach of the U.S. armed forces to trim the deficit, portraying the country’s military might as an essential safeguard of global stability.

The comments to graduating students at the University of Notre Dame came as some Republicans and Democrats look to defense as a way to address the U.S deficit, running about $1.4 trillion for this fiscal year, which ends Sept. 30.

President Obama announced plans in April to hold national security spending below the rate of inflation for the next 12 years, a move that would save about $400 billion, mainly from Defense Department budgets.

Gates, a holdover from the George W. Bush administration who is leaving the post at the end of June, predicted that future calls for major Pentagon cuts could challenge U.S. global leadership.

“As we make the tough choices needed to put this country’s finances in order . . . there will undoubtedly be calls to shrink America’s role in the world, for us to sharply reduce our international commitments and the size and capabilities of our military,” he told the audience at the Indiana university.

But Gates said a properly funded U.S. military “cannot be taken for granted.” He pointed to an unpredictable world grappling with nuclear proliferation, terrorism and Middle East revolutions, as well as a nearly decade-old war in Afghanistan and U.S. efforts to end the war in Iraq.

“Our military credibility, commitment and presence are required to sustain alliances, to protect trade routes and energy supplies, and to deter would-be adversaries,” Gates said.

Gates has repeatedly urged against across-the-board cuts such as those in the 1970s after the Vietnam War or in the 1990s after the Cold War, which he says hollow out the military.

Instead, a strategic review of U.S. military missions and capabilities is in order, he said.

“The lessons of history tell us we must not diminish our ability or our determination to deal with the threats and challenges on the horizon,” Gates said.

Gates has been a strong supporter of greater resources for U.S. diplomacy and economic development, tools commonly referred to as “soft power,” as a way to advance U.S. interests.

“But make no mistake, the ultimate guarantee against the success of aggressors, dictators and terrorists in the 21st century, as in the 20th, is hard power — the size, strength and global reach of the United States military,” he said.

Gates acknowledged that the size of the defense budget needs to be addressed, saying the country’s fiscal imbalances and mounting debt could become a “deep crisis for our nation.”

He cited a need to find ways to further reduce bureaucratic excess and overhead and to examine personnel levels.

When it comes to U.S. military missions and capabilities, Gates said it is important to “separate the desirable or optional from the essential.”

But even as the Pentagon conducts that review, Gates urged the U.S. military not to shrink from the world. He quoted Winston Churchill, saying, “The price of greatness is responsibility.”

— Reuters