Years of protracted wars on two fronts and financial difficulties forced the United States to realign its military spending but U.S President Barack Obama vowed that the new American military will not be any weaker.

Addressing key Pentagon officials on Thursday, Obama admitted that budget reductions on the U.S. Defence Department would radically change the present form of the U.S military forces.

"Our military will be leaner, but the world must know the United States is going to maintain our military superiority," the U.S. President asserted.

"As we end today's wars and reshape our armed forces, we will ensure that our military is agile, flexible and ready for the full range of contingencies," Obama added.

The overhaul faced by the U.S. military could mean troop reduction and reallocation of priorities, defence officials said, but Obama assured that America will not lose its focus on continue to wage war against terror groups among its other ongoing operations.

"Emphasis on countering terrorism, maintaining a nuclear deterrent, protecting the U.S. homeland and deterring and defeating aggression by any potential adversary," are core goals in reshaping the U.S. military, the Associated Press quoted Obama as saying.

Defence Secretary Leon Panetta has indicated that all preparations have been made to prepare the military establishment for some $489 billion worth of budget cuts that will be implemented over the next 10 years, on top of the reported $500 billion set to be slashed by January next year.

Apart from shrinking the number of its forces, Panetta, sources said, will supervise the reconfiguring of America's defence plans, with the possibility of focusing more on Asia Pacific and lesser involvement in Europe.

The plan, however, will maintain its present ties with NATO, AP wrote.

The old stance of maintaining a military force able to fight multi-front wars is now under review, AP said, but Pentagon will not be distracted in closely monitoring the situation in Asia, where the China and Iran have flashing their military muscles lately.

Washington's renewed interest in the Asia Pacific region has been underscored by its recent security pact with Australia, in which U.S. Marines will be deployed in the northeast coast of the country to serve as deterrent to possible conflicts to arise in area.

That side of the world proved as the latest point of interest for key global powers, with deep reserves of oil and natural gas said to be held in South China Sea and prompting active and nominal disputes from neighbouring nations in the area.

In Persian Gulf, America nears possible military confrontation with Iran, only weeks after its withdrawal from Iraq, as Tehran heightens its campaign of intimidation in the region, even warning that it would close down the strategic Strait of Hormuz and slug it out with any naval forces that Obama would dispatch.