The 4th Stryker Brigade held a deployment ceremony Thursday at Joint Base Lewis-McChord to start sending off 3,000 troops.
With plans to withdraw Western troops by 2014, this could be the last major Afghanistan tour.
The News Tribune reported that commanders referenced the assignment in speeches to the troops.
Brig. Gen. B.D. Farris said, "This is not a fight we picked, but we will finish it."
The 4th Stryker Brigade will replace the 3rd Stryker Brigade from Lewis-McChord. Some soldiers will work out of large bases and others in small outposts, training Afghan allies.
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