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updated 1/26/2012 4:29:24 AM ET 2012-01-26T09:29:24

The U.S. Army chief said he is "comfortable" with plans to shrink the size of his force as the Pentagon prepares to slash eight brigades as part of defense cuts worth $260 billion over five years.

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General Raymond Odierno, chief of staff of the Army, told Reuters: "We're now out of Iraq, we're reducing our commitment in Afghanistan, so we can now bring the size of the Army down. And I feel comfortable with how we're going to do that."

He was speaking on Wednesday, as the Pentagon prepared to unveil a smaller Army and the withdrawal of two brigade combat teams from Europe. Those fixed brigades will be replaced by rotational units.

The Pentagon will preview President Barack Obama's budget proposal for the Pentagon on Thursday.

It is expected to cut $260 billion in projected defense spending over the next five years and favor services like the Navy and the Air Force over the Army and Marines.

"It's more about the timeline we bring it down on, and I'm satisfied with that timeline,” Odierno said.

Related: US will have world’s strongest military despite cuts – Panetta

A U.S. official confirmed media reports that the Pentagon plans to slash eight Army brigades and reduce the overall force to as few as 490,000 over the next decade from around 565,000.

But Obama and Defense Secretary Leon Panetta have said they will not hollow-out the force with the kind of cuts the military endured in the wake of the Vietnam war.

Indeed, U.S. officials have pointed to concerns about China's military buildup and North Korea's nuclear advances as they explain plans to focus more on the Asia-Pacific region.

Related: New defense strategy sets Obama's gaze on Asia

Odierno, fresh from a trip to Asia, acknowledged the need for naval and air assets in any military strategy for the Pacific.

But he stressed that the Army will keep playing an important role in the region, and pointed to the 19,160 soldiers deployed in South Korea as a deterrent against the North.

Indeed, Odierno saw no downsizing of the Army presence in Asia and said it will further supplement its forces with troops who rotate in and out of the region.

"That's what we got to decide: How much rotational presence will we be able to do," Odierno said.

Related: Pentagon to unveil revised defense strategy

Odierno noted that the Army could play an important diplomatic role engaging with militaries in Asia, given that 22 out of the 28 chiefs of defense in the Pacific are army officers.

Seven out of the world's 10 largest land armies in the world are in the Pacific, he added.

That common army background "will help us to build relationships," he said.

More content from msnbc.com and NBC News

Reuters and the Associated Press contributed to this report.

Reuters and The Associated Press contributed to this report.

Photos: Living in the combat zone

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  1. U.S. infantry soldier Sgt. Michael Irwin relaxes on his bed at a Combat Operating Post Charkh in south Logar Province, Afghanistan, in September 2009. The post is southwest of Kabul, in a mostly rural area dotted by fruit orchards and corn fields. This group of soldiers was the first non-Afghan patrol force in this area. Irwin serves with the 3rd Platoon, Bravo Company, 1st Battalion, 32nd Infantry Regiment, 3rd Brigade, 10th Mountain Division. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  2. A pile of extra mattresses offers a recreational opportunity at COP Charkh. From left, Sgt. John Virgadamo, Spc. Matthew Ledford and Spc. Brian Lucey watch as Pvt. 2 Adam Ramsey takes the leap. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  3. From left, Sgt. Michael Irwin, Spc. Daniel Brand and Sgt. Daniel Hernandez shave and wash their faces at the post in Charkh. Infantry soldiers are generally young—most between 19 and 25--which helps them endure the grueling physical demands of the infantry. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  4. U.S. soldiers patrol in Logar Province. The troops spent most of their time patrolling on foot, walking three to five miles a day. They met with villagers and village officials to inquire about the community and to provide security or humanitarian assistance if needed. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  5. Spc. John Alamo returns fire at enemy combatants during a patrol in Logar Province. The troops avoid traveling in vehicles, which are more likely to hit roadside bombs. But traveling on foot makes them more susceptible to small-arms fire. Firefights are frequent when they patrol during the summer months. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  6. Spc. Justin Rottenberry sleeps in a secured area while on several day patrol from COP Charkh. The soldiers in the unit were based in Fort Drum in upstate New York but came from all over the country. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  7. Soldiers attend a mission briefing in the cafeteria at the Charkh post. The briefings happen most evenings, particularly before missions to plan for the next day. From left, Spc. Darren Stovall, Spc. Adlin Zukic, Pfc. Ryan Cooley, Spc. Devon Singleton, Spc. Justin Morris and Sgt. Daniel Hernandez. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  8. Pfc. Cody Marshall smokes a cigarette at the Combat Operating Post. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  9. Pfc. Ryan Cooley sits on a pile of water bottle supplies at the post in Charkh. Photojournalist Erin Trieb says the lives of soldiers on tour get stripped down to the essentials--eat, sleep, and survive. Staying hydrated during long patrols through dry, dusty mountains and hot valleys is a critical part of the survival equation. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  10. Soldiers take cover while an Afghan National Army soldier returns to the platoon with information, in the Tangi Valley, Wardack Province, Afghanistan, Sept. 2009. The U.S. soldiers on the left are from the 1st Platoon, Alpha Company, 2nd Battalion, 87th Infantry Regiment, 3rd Brigade, 10th Mountain Division. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  11. Staff Sgt. Cody Anderson rests after a patrol in the Tangi Valley, Wardack Province, Afghanistan. Anderson is part of the 1st Platoon, Alpha Company, 2nd Battalion, 87th Infantry Regiment, 3rd Brigade, 10th Mountain Division. Sgt. Anderson had a difficult time when he returned home to America. He is the first soldier profiled in our video report on the challenges of post-traumatic stress disorder. Watch it here. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  12. Soldiers attend to Spc. James Rogers, who was injured when an IED detonated underneath his military vehicle in the Tangi Valley. The soldiers were from the 1st Platoon, Alpha Company, 2nd Battalion, 87th Infantry Regiment, 3rd Brigade, 10th Mountain Division. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  13. Soldiers open mail and care packages in their room at the post at Charkh. Because of the remoteness of the outpost, care packages took weeks to arrive. From left, Pvt. 2 Adam Ramsey, Spc. Aldin Zukic and Spc. Jason Vann of the 3rd Platoon, Bravo Company, 1st Battalion, 32nd Infantry Regiment, 3rd Brigade, 10th Mountain Division. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  14. A soldier looks at the Sports Illustrated magazine swimsuit issue at the post at Charkh. The magazine arrived in a care package; no pornography is allowed. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  15. Infantry soldiers Spc. Daniel Brand, center, and Spc. Darren Stovall, far right run toward a guard tower to return fire after the Combat Operating Post at Charkh was attacked. Brand was exercising in his physical training clothes at the time of the attack and didn't have time to change into uniform. The soldiers are from Bravo Company, 1st Battalion, 32nd Infantry Regiment, 3rd Brigade, 10th Mountain Division. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  16. Spc. Matthew Ledford rests after a firefight at the Charkh post. This company experienced some of the most intense fighting in the region. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  17. Spc. Aldin Zukic, left, and Pfc. Donald Garab roughhouse in their room in the post at Charkh. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  18. Sgt. Waylon Frederick (left), Sgt. Brian Cattaneo and Spc. Joseph Pohl play cards during down time at the Charkh combat post. The soldiers are from Bravo Company, 1st Battalion, 32nd Infantry Regiment, 3rd Brigade, 10th Mountain Division. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  19. Spc. Dirk Terpstra, left, and Sgt. Darren Stovall practice high kicks to pass the time at the Charkh combat post. They are part of Bravo Company, 1st Battalion, 32nd Infantry Regiment, 3rd Brigade, 10th Mountain Division.

    Terpstra, who had experienced a personal trauma before enlisting in the military, committed suicide after his return home. In our video report on the difficulties some soldiers face when they return home, his mother Gail says: “He didn’t share. He didn’t open up.” (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  20. From left, Pvt. 2 Adam Ramsey, Pfc. Ryan Cooley, Spc. Jason Vann and Spc. Aldin Zukic pass the time by smoking cigarettes. They serve in 3rd Platoon, Bravo Company, 1st Battalion, 32nd Infantry Regiment, 3rd Brigade, 10th Mountain Division. Photojournalist Erin Trieb noted: "These guys are with each other day in and day out, they really grow together .... The bond they forge when fighting together is unbreakable. They’re like brothers."

    During and after his tour in Afghanistan, Adam Ramsey experienced severe depression, leading him to attempt suicide. He describes his difficult return home in our video report . (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  21. Spc. Chris Conte of Bravo Company stands guard while on patrol in the south of Logar Province. He could hear gunfire in the distance of another platoon being fired upon and retaliating. The company had been on patrol since 2 a.m., so Conte was guarding an Afghan dwelling while his fellow troops were taking a rest. The soldiers detained a suspected insurgent that day. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  22. Staff Sgt. DeAndre Daniels investigates a vehicle blown up by an IED on a patrol in central Logar Province. The vehicle was hit by an IED 15 minutes earlier. A search for the person who detonated the bomb turned up nothing. It took 10 hours for the soldiers and photographer to be evacuated back to the outpost Daniels is part of 2nd Platoon, Alpha Battery, 4th Battalion, 25th Field Artillery Regiment, 3rd Brigade, 10th Mountain Division. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
  23. Spc. Christopher Ostrander sits in an MRAP, wounded after an IED detonated under his vehicle while on patrol in central Logar Province. Initially, Ostrander's wound appeared slight -- a cut on the head. But he was taken by helicopter to a trauma center where it was discovered that his skull was cracked. He is with the 2nd Platoon, Alpha Company, 4th Battery, 25th Field Artillery Regiment, 3rd Brigade, 10th Mountain Division. (Erin Trieb / VII Mentor Program) Back to slideshow navigation
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  1. The Lives Of Soldiers
    Erin Trieb / VII Mentor Program
    Above: Slideshow (23) Living in the combat zone
  2. Image: Afghan National Army soldier Mirza Mirzali, a Pashtun from Jalalabad, eastern Afghanistan
    Kevin Frayer / AP
    Slideshow (10) Soldiers of the Afghan National Army

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