"We're the heart of the U.S. military. Our sons and daughters serve and our neighbors build military ships." That's how a fan put it this week as I autographed a copy of "American Heroes" for him during a book signing session. Then he added, "I hope that doesn't change." He has reason for concern — as do those who work at nearby Pascagoula Naval shipyard or Keesler Air Force Base or who serve anywhere in our nation's uniform.

President-elect Barack Obama said on election night that, "change has come to America." Though the next commander-in-chief has yet to announce exactly how he intends to do it, he clearly intends to change the commitments, capabilities and cost of America's military.

Commitments:

Candidate Obama made "ending the war and getting out of Iraq" the centerpiece of his foreign policy platform from the very beginning of his campaign two years ago. He has never recanted on his goal of "bringing our troops home within sixteen months of taking office." He is also adamant that more U.S. and NATO troops are needed in Afghanistan.

Watch a brand-new episode of "War Stories: The Battle for Afghanistan," Sat., November 8 at 9 p.m. ET

Thanks to the courage and perseverance of young Americans in flak jackets, helmets and flight suits, the campaign against radical Islam in Mesopotamia is all but over. Iraqi soldiers and police now carry out most combat operations against Sunni and Shiite terrorists and militias. A phased pull-out from Iraq will indeed free up U.S. combat units for Afghanistan where they are needed.

But a "total pull-out" from Iraq invites the theocrats in Tehran — intent on acquiring nuclear weapons and the world-leaders in exporting terror — to further ambition and adventure in the region. This week, Iraq's Foreign Minister Hoshiyar Zebari, obviously concerned about a premature U.S. retreat, said that candidate Obama "reassured us that he would not take any drastic or dramatic decisions." In case the point was missed, he added, "When there is a reality check, I think any U.S. president has to look very hard at the facts on the ground. The gains that we have attained and won with hard struggle and a great deal of sacrifice need to be sustained."

Hopefully, before he pulls the plug on "The Land Between the Rivers," the new commander-in-chief will listen carefully to the counsel of Generals David Petraeus, Ray Odierno in Iraq and David McKiernan in Afghanistan. Making decisions now about force dispositions after inauguration may well placate his far left base, but could well prove disastrous for the nation.

Capabilities:

Even before the election, leading Democrats in the House and Senate were prognosticating a "transformation" in U.S. defense capabilities. The two most recent Democrat presidents made similar promises. When Jimmy Carter came to office he all but eliminated our "Humint" — Human Intelligence — capabilities and ordered an "across the board" reduction of 15 percent in everything from ships, to planes to "end strength" — the number of soldiers, sailors, airmen, Guardsmen and Marines in the services.

Bill Clinton did the same thing — only bigger. Half the Army's divisions disappeared — along with scores of ships and combat air wings. He also introduced the "don't ask, don't tell" policy to allow homosexuals to serve in the Armed Forces.

The net effect of both presidents' capabilities cuts was to embolden America's adversaries. Arguably, American troops are still paying in blood for the "cost cutting" done during the Carter and Clinton administrations. That may well be happening again — in an ever more dangerous world.

Cost Cutting:

When the moving vans roll up to 1600 Pennsylvania Avenue in January, it will be the first time since Richard Nixon took over from Lyndon Johnson that our nation changed commander-in-chief while at war. Yet, leaks from the Obama "transition team" and Capitol Hill indicate that cuts in defense spending are a top priority.

Pulling U.S. troops out of Iraq would "save" $10 billion per month. Further "savings" can be found by cutting production of the F-35 Strike Fighter, the F-22 Raptor, Virginia class nuclear attack submarines, the V-22 Osprey, and the DDG-1000 destroyer. Converting National Missile Defense back to a basic research program, eliminating two USAF fighter wings and putting a U.S. Navy Carrier Battle Group in mothballs would "save" hundreds of billions more. Representative Barney Frank, chairman of the House Financial Service Committee, has called for a 25 percent reduction in the Pentagon budget — about $150 billion — and said, "We don't need all these fancy new weapons."

Any of these cuts will have the effect of seriously reducing U.S. defense capabilities. One parochial example: The V-22 Osprey is programmed to replace all of the U.S. Marines' 40-year-old CH-46 helicopters. Without the Osprey, Marines will have to walk to the next gunfight.

In his first remarks as president-elect, Obama promised defeat to "those who would tear the world down." If that's what he really wants to do, prudence dictates that he ought not to start by tearing apart our nation's defenses.

Oliver North hosts War Stories on FOX News Channel and is the author of the new best-seller, "American Heroes: In The War Against Radical Islam." He has just returned from assignment in Afghanistan.

Lt Col Oliver L. North (ret.) serves as host of the Fox News Channel documentary series "War Stories with Oliver North." From 1983 to 1986, he served as the U.S. government's counterterrorism coordinator on the National Security Council staff. North is the founder of Freedom Alliance, an organization providing college scholarships to the children of military personnel killed in the line of duty and author of the new nationwide bestseller, "Counterfeit Lies," a novel about how Iran is acquiring nuclear weapons and the means of delivering them. Click here for more information on Oliver North