“We will have a robust continuing presence throughout the region, which is proof of our ongoing commitment to Iraq and to the future of that region, which holds such promise and should be freed from outside interference to continue on a pathway to democracy,” Secretary of State Hillary Rodham Clinton said in Tajikistan after the president’s announcement.

During town-hall-style meetings with military personnel in Asia last week, the secretary of defense, Leon E. Panetta, noted that the United States had 40,000 troops in the region, including 23,000 in Kuwait, though the bulk of those serve as logistical support for the forces in Iraq.

As they undertake this effort, the Pentagon and its Central Command, which oversees operations in the region, have begun a significant rearrangement of American forces, acutely aware of the political and budgetary constraints facing the United States, including at least $450 billion of cuts in military spending over the next decade as part of the agreement to reduce the budget deficit.

Officers at Central Command said that the post-Iraq era required them to seek more efficient ways to deploy forces and maximize cooperation with regional partners. One significant outcome of the coming cuts, officials said, could be a steep decrease in the number of intelligence analysts assigned to the region. At the same time, officers hope to expand security relationships in the region. General Horst said that training exercises were “a sign of commitment to presence, a sign of commitment of resources, and a sign of commitment in building partner capability and partner capacity.”

Col. John G. Worman, Central Command’s chief for exercises, noted a Persian Gulf milestone: For the first time, he said, the military of Iraq had been invited to participate in a regional exercise in Jordan next year, called Eager Lion 12, built around the threat of guerrilla warfare and terrorism.

Another part of the administration’s post-Iraq planning involves the Gulf Cooperation Council, dominated by Saudi Arabia. It has increasingly sought to exert its diplomatic and military influence in the region and beyond. Qatar and the United Arab Emirates, for example, sent combat aircraft to the Mediterranean as part of the NATO-led intervention in Libya, while Bahrain and the United Arab Emirates each have forces in Afghanistan.

At the same time, however, the council sent a mostly Saudi ground force into Bahrain to support that government’s suppression of demonstrations this year, despite international criticism.