Getting access to  San Antonio's military bases is about to get a lot more difficult.

Under a plan that's being rolled out today, everyone from soldiers to civilian visitors and contractors will be screened against the FBI's criminal database.

"On Aug. 8, the Identity Matching Engine for Security and Analysis (IMESA) will be functional for any installation with the capability to scan persons entering the installation and have implemented the IMESA interface with Defense Manpower Data Center (DMDC)," Pentagon Spokeswoman Lt. Col. Valerie Henderson tells Newsradio 1200 WOAI.

This new Defense Department plan is part of a larger effort, after the Fort Hood shooting, to crack down on who has access to secure facilities.

"There are Air Force, Army, Marine, and Defense Logistics Agency installations that will have IMESA functional on 8 Aug," Lt. Col. Henderson says.

The program will be rolled out in different ways at different bases, but it will all work about the same way.  People wanting access will have their credential scanned.  If a guard receives a red flag, they will stop the person from entering and the police will be notified.

In September of last year, the gunman Aaron Alexis used a valid id card to get onto the Navy Yard in Washington D.C., despite having an arrest record.  Twelve people were shot and three people were injured.

Right now, the IMESA will only be linked in to the FBI database but the plan is, in the future, to link it to state and local crime databases as well.