Washington ? The Army’s top general warned on Thursday that his force “will break” without thousands more active duty troops and greater use of the reserves. He issued the warning as President Bush considers new strategies for Iraq.

As part of the effort to relieve the strain on the force, the Army is developing plans to accelerate the creation of two new combat brigades, The Associated Press has learned.

According to defense officials, the plan may require shifting equipment and personnel from other military units so the two new brigades could be formed next year and be ready to be sent to the war zone in 2008. The officials spoke on condition of anonymity because the plans are not final.

Noting the strain put on the force by operations in Iraq, Afghanistan and elsewhere, Gen. Peter J. Schoomaker said he wants to increase his half-million-member Army beyond the 30,000 troops already authorized in recent years.

Though he didn’t give an exact number, he said it would take significant time, saying 6,000 to 7,000 soldiers could be added per year. Schoomaker has said it costs roughly $1.2 billion to increase the Army by 10,000 soldiers.

Officials also need greater authority to tap into the National Guard and Reserve, long ago set up as a strategic reserve but now needed as an integral part of the nation’s deployed forces, Schoomaker told a commission studying possible changes in those two forces.

“Over the last five years, the sustained strategic demand … is placing a strain on the Army’s all-volunteer force,” Schoomaker told the commission in a Capitol Hill hearing. He added, “At this pace … we will break the active component” unless reserves can be called up more to help.

Accelerating the creation of two combat brigades would give the Army greater flexibility to allow units to return home for at least a year before having to go back to the battlefront. Brigades average 3,500 troops.

White House spokesman Tony Snow declined to characterize Bush’s response to Schoomaker’s comments, but he said Bush “takes seriously any of the requests from the service branch chiefs.”