CAMP FALLUJAH, Iraq -- In an effort to quell recent attacks, Marines of 3rd Battalion, 4th Marine Regiment are pinpointing military-aged males for a population study.Marines spend the day sorting through a long line of Fallujah citizens waiting to enter one of four entry control points (ECP) run by the battalion.Most pass through the ECP without delay, showing their newly issued identification cards. Those without I.D. are escorted inside the compound to be questioned and given their new pass to the city."If all they have are the Iraqi ID's, they go to the B.A.T. cave," said Cpl. Travis E. Bennett, 23-year-old squad leader for Weapons Company and native of Mount Vernon, Oreg. The small wooden building known as the B.A.T. cave is home to the Biometrics Automated Toolset, which Marines use to identify military aged males entering the city.The B.A.T. facility processes more than 200 citizens a day for entry into the city. That's more than 10% of the daily rush of people, according to Bennett.Thumb-printing, iris scans and personal information are submitted to an FBI database. This information is also used by Marine and Iraqi coalition forces within the city.The information aids the battalion by providing a quick means of identification of citizens caught committing crimes, according to Maj. Matt O. Watt, the 33-year-old operations officer for the battalion."If we detain someone on the street with no I.D., we can scan their eyes or take their fingerprints to find out who they are," said Staff Sgt. Shay J. Heary, the 29-year-old 1st section leader for Weapons Co. and native of Genesee, Idaho.After providing the information required for the database, citizens are issued a paper I.D. for entrance into the city and guided through the ECP. All citizens who receive ID's this way, or already have proper identification, gain access through the entry control points without problems. For those citizens who don't take the proper steps, access is quickly denied. "If they have no ID at all, they're turned away," Bennett said. "We also catch a lot of fake IDs." The B.A.T. is just another weapon in the fight for Iraqi freedom and the Global War on Terrorism. As Marines of 3rd Battalion, 4th Marine Regiment continue the fight, insurgents have one more thing to worry about, according to Bennett.