Dave Shearman (former USMC), having served as a police officer on the mean streets of Los Angeles in the Rampart Division CRASH anti-gang unit, headed to Iraq and Afghanistan as a LEP (Law Enforcement Professional) to be embedded in military units in order to use his policing skills to run interdiction of terrorists and their money, drug and weapons smuggling.
Being part of that strategic program, he and his fellow LEP's were wildly successful in discovering, confiscating and destroying vast amounts of drugs, weapons and explosives. You can read about it in the book he co-authored with JT Taman titled "Outside The Wire In Blue".
You can find the book at www.outsidethewireinblue.com.