An additional 1,940 members of the military reserves and National Guard were called to active duty Tuesday, as the Pentagon's plan to call up as many as 50,000 reservists to help with U.S. recovery efforts and air defenses moved forward.

The newly-activated troops — made up of 835 members of the Naval Reserve and 300 from the Army Reserve and Army National Guard — are from 16 states, the District of Columbia and Puerto Rico. The rest are from Air Force Reserve and Air National Guard units across the country. 

They bring to 14,318 the number of Reserve and National Guard members called so far under a partial mobilization order President Bush signed after the Sept. 11 attacks. Bush authorized the Pentagon to call as many as 50,000 to active duty.

Also, officials at Fort Campbell, Ky., said about 200 soldiers from the 101st Airborne Division were sent to each of two chemical weapons storage facilities in Kentucky and Indiana to augment security. A spokeswoman said there had been no specific threat against either place.

Bush has vowed repeatedly to "rid the world of evildoers," but Defense Secretary Donald H. Rumsfeld said Monday that U.S. goals were more modest and the campaign against terrorism will not completely eradicate it. 

"There is not going to be a D-Day, as such, and I'm sure there will not be a signing ceremony on the Missouri, as such," Rumsfeld told a Pentagon news conference. He referred to the final allied push in Europe in June 1944 and the signing of surrender papers aboard the USS Missouri in Tokyo Bay in 1945.

"This is not something that begins with a significant event or ends with a significant event," he said. "It is something that will involve a sustained effort over a good period of time."

Rumsfeld predicted the campaign would last "not five minutes or five months," but years.

Rumsfeld's remarks continued a Bush administration effort to prepare the public for a difficult, costly and sustained anti-terrorism campaign that is likely to suffer deadly setbacks as well as secret successes.

"It will not be an antiseptic war, I regret to say," he said. "It will be difficult. It will be dangerous. And ... the likelihood is that more people may be lost."

The Sept. 11 terrorist attacks against the United States left nearly 7,000 people dead or missing in New York City, at the Pentagon and in Pennsylvania.

The military campaign -- separate from the financial, diplomatic and law enforcement tools being mobilized against terrorism -- has been code-named "Enduring Freedom," Rumsfeld said.

The name first chosen, "Infinite Justice," was scrapped after the administration recognized that in the Islamic faith such finality is considered something provided only by Allah, the Arabic word for God.

Rumsfeld said the anti-terror effort will not require a large-scale ground attack.

"It is by its very nature something that cannot be dealt with by some sort of massive attack or invasion," he said. "It is a much more subtle, nuanced, difficult, shadowy set of problems."

The U.S. forces being assembled in the Persian Gulf and Arabian Sea certainly are not subtle. They include at least two aircraft carriers, with two more reportedly headed in that direction, from the Atlantic and Pacific. Each ship carries about 5,000 sailors and 75 aircraft and is accompanied by about a dozen warships, generally including attack submarines capable of firing cruise missiles.

The United States also has warplanes at land bases in Saudi Arabia and elsewhere in the Persian Gulf region, and it plans to put Air Force B-52 bombers on the Indian Ocean island of Diego Garcia.

A key element of the military campaign is expected to be U.S. special operations forces, the clandestine warriors who operate behind enemy lines, sometimes in helicopter-born raids to kill, kidnap or sabotage.

Rumsfeld was asked about remarks by Russian President Vladimir Putin that Central Asian nations such as Uzbekistan and Tajikistan have not ruled out allowing the use of their air bases for anti-terror strikes into neighboring Afghanistan, which is accused of harboring alleged terrorist mastermind Osama bin Laden.

Rumsfeld said the administration has been in contact with Moscow on "a number of aspects" of the anti-terrorism effort. But he left it to spokesmen for other governments to say what basing arrangements have been worked out for American forces.

He also suggested the administration has yet to see clearly how its various anti-terrorism tools will squash bin Laden's al-Qaida organization and punish those who support it, including the Taliban religious militia that rules most of Afghanistan.

"It's a little like a billiard table," he said. "The balls careen around for a while and you don't know what'll do it, but the end result, we would hope, would be a situation where the al-Qaida is heaved out and the people in Taliban who think that it's good for them and good for the world to harbor terrorists ... lose, and lose seriously."

The Associated Press contributed to this report.