"for a time the Tra Bong compound went crazy with MP and CID types."

The US Army Criminal Investigation Command (CID) is responsible for investigating crimes within the Army. Their headquarters are at Quantico, Virginia, and they operate throughout the world.

CID Special Agents conduct criminal investigations ranging from death to fraud. They work with local, state and other federal investigative agencies. CID also provides security and conducts protective service and force protection operations. During battlefield operations, CID’s investigations can include war crimes, anti-terrorism, and other serious crimes.

CID was established during WWI by General John J. Pershing.