WASHINGTON -- The shifting of troops and jobs from the Northeast to the Sunbelt and the West. The consolidation of scores of Reserve and Guard sites across the map. Mergers throughout the four service branches to create super-sized multipurpose bases.

Defense Secretary Donald H. Rumsfeld and Gen. Richard Myers, chairman of the Joint Chiefs of Staff, are to testify Monday before a congressionally chartered commission that will review the base closing proposal.

"You're seeing consolidation both on the administrative side and at the war-fighting level," said David Berteau, a former acting assistant secretary of defense who oversaw base closings for the Pentagon in 1991 and 1993.

Analysts say that means all four service branches would have to change the way they now operate. Army, Navy, Air Force and Marine Corps troops would have to learn how to do their jobs in concert with each other.

Steve Grundman, a former deputy undersecretary of defense during the Clinton administration, said the Pentagon has taken bold moves.

The Pentagon estimates the closures would save $48 billion over 20 years.

The plan recommends closing or reducing forces at 62 major bases and reconfiguring hundreds of others to save billions of dollars a year.

On the chopping block are two major New England bases that supporters say are economic engines of the Northeast.

Analysts say the bases were essential decades ago to defend against threats, mainly from the Soviets, that no longer are prevalent.

The Pentagon projects that closing the two major bases and several smaller military sites in Connecticut and Maine would mean the loss of nearly 30,000 jobs -- on and off the bases. Work would shift to facilities in Norfolk, Va. and Kings Bay, Ga., defense officials say, which already provide enough fleet coverage for the Eastern seaboard.

Under the plan, bases in Florida, Georgia, South Carolina and Alabama would add thousands of troops, with affected communities gaining at least 35,000 total new jobs -- and an economic shot in the arm.

Bases in Colorado, Nevada, Oklahoma and Texas -- where land is cheaper and plentiful -- would see increases, too.

Both regions would absorb troops from other domestic bases set to be closed or reduced, and from Europe and Asia, where about 170,000 U.S. troops and their families are stationed. They will be returning home as the Pentagon adjusts its worldwide presence.

Also, military missions spread throughout the United States to defend against a Soviet nuclear attack would merge, sometimes at super-sized installations, according to Rumsfeld's plan.

For example, the F-16 fighter planes at Cannon Air Force Base in Clovis, N.M., would be used to bolster F-16 bases elsewhere and the B-1 strategic bombers at Ellsworth Air Force Base in Rapid City, S.D., would move to the other B-1 base, Dyess, near Abilene, Texas.

Many tiny Reserve and National Guard facilities also would be centralized.

Rumsfeld proposed more cost-effective operations by combining medical buildings, accounting offices, training installations, education facilities, and bases focused on technology initiatives.

"You're seeing consolidation both on the administrative side and at the war-fighting level," said David Berteau, a former acting assistant secretary of defense who oversaw base closings for the Pentagon in 1991 and 1993.

Analysts say that means all four service branches would have to change the way they now operate. Army, Navy, Air Force and Marine Corps troops would have to learn how to do their jobs differently and in concert with each other.

Steve Grundman, a former deputy undersecretary of defense during the Clinton administration, said the Pentagon has taken bold moves.

But, he said, "One of the consequences of this very impressive churn -- not closing things but shuffling things around in a really precise way -- is it's expensive because the receiving installations typically have to invest in the infrastructure and other costs involved." That, he said, could mean fewer upfront savings.

The Pentagon estimates the closures would save $48 billion over 20 years.

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On the Net:

Pentagon's base closing plan at http://www.defenselink.mil/brac/