Fighter jets made in America will now be flying in other countries for years to come, meaning continued profits for American contractors that maintain them, and in many cases regular interaction between the United States military and foreign air forces, Mr. Lemkin, the Air Force official, said.

Sales are also being driven by the push by many foreign nations to join the once-exclusive club of countries whose arsenals include precise, laser-guided missiles, high-priced American technology that the United States displayed during its invasions of Iraq and Afghanistan.

In the Persian Gulf region, much of the rearmament is driven by fears of Iran.

The United Arab Emirates, for example, are considering spending as much as $16 billion on American-made missile defense systems, according to recent notifications sent to Congress by the Department of Defense.

The Emirates also have announced an intention to order offensive weapons, including up to 26 Black Hawk helicopters and 900 Longbow Hellfire II missiles, which can knock out enemy tanks.

Saudi Arabia, this fiscal year alone, has signed at least $6 billion worth of agreements to buy weapons from the United States government — the highest figure for that country since 1993, which was another peak year in American weapons sales, after the first Persian Gulf war.

Israel, long a major buyer of United States military equipment, is also increasing its orders, including planned purchases of perhaps as many as four American-made coastal warships, worth $1.9 billion.

In Asia, as North Korea has conducted tests of a long-range missile, American allies have been buying more United States equipment. One ally, South Korea, has signed sales agreements with the Pentagon this year worth $1.1 billion.

So far, the value of foreign arms deliveries completed by the United States has increased only modestly, reaching $13 billion last year compared with an average of $12 billion over the previous three years. Because complex weapons systems take a long time to produce, it is expected that the increase in sales agreements will result in much greater arms deliveries in the coming years. (All dollar amounts for previous years cited in this article have been adjusted to reflect the impact of inflation.)

The flood of sophisticated American military equipment pouring into the Middle East has evoked concern among some members of Congress, who fear that the Bush administration may be compromising the military edge Israel has long maintained in the region.

Not surprisingly, two of the biggest new American arms customers are Iraq and Afghanistan.

Just in the past two years, Iraq has signed more than $3 billion of sales agreements — and announced plans to buy perhaps as much as $7 billion more in American equipment, financed by its rising oil revenues.

Lt. Col. Almarah Belk, a Pentagon spokeswoman, said that making these sales served the interests of both Iraq and the United States because “it reduces the risk of corruption and assists the Iraqis in getting around bottlenecks in their acquisition processes.”

Over the past three years, the United States government, separately, has agreed to buy more than $10 billion in military equipment and weapons on behalf of Afghanistan, according to Defense Department records, including M-16 rifles and C-27 military transport aircraft.

Even tiny countries like Estonia and Latvia are getting into the mix, playing a part in a collaborative effort by 15 countries, mostly in Europe, to buy two C-17 Boeing transport planes, which are used in moving military supplies as well as conducting relief missions.

Boeing has delivered 176 of these $200 million planes to the United States. But until 2006, Britain was the only foreign country that flew them. Now, in addition to the European consortium, Canada, Australia and Qatar have put in orders, and Boeing is competing to sell the plane to six other countries, said Tommy Dunehew, Boeing’s C-17 international sales manager.

In the last year, foreign sales have made up nearly half of the production at the California plant where C-17s are made. “It has been filling up the factory in the last couple of years,” Mr. Dunehew said.

Even before this new round of sales got under way, the United States’ share of the world arms trade was rising, from 40 percent of arms deliveries in 2000 to nearly 52 percent in 2006, the latest year for which the Congressional Research Service has compiled data. The next-largest seller was Russia, which in 2006 accounted for 21 percent of global deliveries.

Representative Berman, who sponsored a bill passed in May to overhaul the arms export process, said American military sales, while often well intended, were sometimes misguided. He cited military sales to Pakistan, which he said he feared were doing more to stoke tensions with India than combat terrorism in the region.

Travis Sharp, a military policy analyst at the Center for Arms Control and Nonproliferation, a Washington research group, said one of his biggest worries was that if alliances shifted, the United States might eventually be in combat against an enemy equipped with American-made weapons. Arms sales have had unintended consequences before, as when the United States armed militants fighting the Soviets in Afghanistan, only to eventually confront hostile Taliban fighters armed with the same weapons there.

“Once you sell arms to another country, you lose control over how they are used,” Mr. Sharp said. “And the weapons, unfortunately, don’t have an expiration date.”

But Mr. Lemkin, of the Pentagon, said that with so many nations now willing to sell advanced weapons systems, the United States could not afford to be too restrictive in its own sales.

“Would you rather they bought the weapons and aircraft from other countries?” he said. “Because they will.”