US Defense Secretary Leon Panetta gestures as he briefs the media at the Pentagon Briefing Room in Washington, DC January 26, 2012. [Photo/Agencies]

WASHINGTON - The Pentagon unveiled a 2013 budget plan that would cut $487 billion in spending over the next decade by eliminating nearly 100,000 ground troops, mothballing ships and trimming air squadrons in a bid to create a smaller, agile force with a new strategic focus.

The funding request, which includes painful cuts that will be felt across the country, comes at a historic turning point for the military as it winds down 10 years of war in Afghanistan and Iraq and shifts its strategic focus to the Asia-Pacific region and the Middle East.

The budget plan, sharply criticized by some lawmakers, sets the stage for a new struggle between President Barack Obama's administration and Congress over how much the Pentagon should spend on national security as the country tries to curb its trillion-dollar budget deficits.

"Make no mistake, the savings that we are proposing will impact all 50 states and many districts, congressional districts across America," Defense Secretary Leon Panetta told a news conference at the Pentagon on Thursday.

"This will be a test of whether reducing the deficit is about talk or action."

Panetta, previewing a budget to be made public Feb 13, said he would ask for a $525 billion base budget for the 2013 fiscal year, the first time since before the Sept 11, 2001, attacks that the Pentagon has asked for less than the previous year. That compares with $531 billion approved this year.

Panetta said he would seek $88.4 billion to support overseas combat operations, primarily in Afghanistan, down from $115 billion in 2012 largely due to the end of the war in Iraq and the withdrawal of US forces there at the end of last year.

Congress ultimately controls the Pentagon's purse strings and regularly intervenes to change the size and detail of military spending as it sees fit. The Defense Department's budget accounts for about 20 percent of total federal spending.

Republican lawmakers who oversee military affairs on Capitol Hill sharply criticized the plan.

Senator John McCain said it "ignored the lessons of history" by imposing massive cuts on the military, and Representative Buck McKeon said it reflected "Obama's vision of an America that is weakened, not strengthened, by our men and women in uniform."