Chief of Staff of the US Army, Gen. George W. Casey Jr., talks with a Soldier while observing a Full Spectrum Operation exercise in Ft. Polk, LA, Saturday, Oct. 23, 2010. The Full Spectrum exercise focuses on facing and defeating a hybrid threat re...

Brig. Gen. Jim Yarbrough, Commanding Gen. of Joint Readiness Training Center, talks with Chief of Staff of the US Army, Gen. George W. Casey Jr., during a Full Spectrum Operation exercise in Ft. Polk, LA, Saturday, Oct. 23, 2010. The Full Spectrum e...

A Soldier provides security to a command center during a Full Spectrum Operation exercise in Ft. Polk, LA, Saturday, Oct. 23, 2010. The Full Spectrum exercise focuses on facing and defeating a hybrid threat representing both an insurgent force and a...

Soldiers leave their defensive fighting positions while preparing for an attack during a Full Spectrum Operation exercise in Ft. Polk, LA, Saturday, Oct. 23, 2010. The Full Spectrum exercise focuses on facing and defeating a hybrid threat representi...

Soldiers huddle up during a "tactical freeze" portion of the Full Spectrum Operation exercise in Ft. Polk, LA, Saturday, Oct. 23, 2010. The Full Spectrum exercise focuses on facing and defeating a hybrid threat representing both an insurgent force a...

Chief of Staff of the US Army, Gen. George W. Casey Jr., joins Company Commanders and 1st Sgt.s during a "tactical freeze" portion of a Full Spectrum Operation exercise in Ft. Polk, LA, Saturday, Oct. 23, 2010. The Full Spectrum exercise focuses on ...

Chief of Staff of the US Army, Gen. George W. Casey Jr., salutes the a portion of the leadership participating in the Full Spectrum Operation exercise in Ft. Polk, LA, Saturday, Oct. 23, 2010. The Full Spectrum exercise focuses on facing and defeati...

A command staff operates while the Chief of Staff of the US Army, Gen. George W. Casey Jr., observes the scenario during a Full Spectrum Operation exercise in Ft. Polk, LA, Saturday, Oct. 23, 2010. The Full Spectrum exercise focuses on facing and de...

Chief of Staff of the US Army, Gen. George W. Casey Jr., joins Company Commanders and 1st Sgt.s during a "tactical freeze" portion of a Full Spectrum Operation exercise in Ft. Polk, LA, Saturday, Oct. 23, 2010. The Full Spectrum exercise focuses on ...