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 ...

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...

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...

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...

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...

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...

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...

Col. Carl Alex, commander of the 3rd Brigade Combat Team, 82nd Airborne Division, briefs Chief of Staff of the US Army, Gen. George W. Casey Jr., about operations being conducted as part of the Full Spectrum Operation exercise in Ft. Polk, LA, Satur...

Col. Carl Alex, commander of the 3rd Brigade Combat Team, 82nd Airborne Division, briefs Chief of Staff of the US Army, Gen. George W. Casey Jr., about operations being conducted as part of the Full Spectrum Operation exercise in Ft. Polk, LA, Satur...

Chief of Staff of the US Army, Gen. George W. Casey Jr., enters a tent to observe 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 hybri...