The steps were taken just a day after a gunman attacked two military facilities in Chattanooga, leaving four Marines and one sailor dead. Suspected gunman Mohammad Youssef Abdulazeez was killed in the attacks on a joint-service recruiting station and a nearby Navy Operational Support Center.
One of the steps Carter approved was Marine Corps Recruiting Command's decision to have recruiters not wear their military uniforms for now, a defense official said. The recruiting command also closed down all offices within 40 miles of the facilities in Chattanooga and increased the force protection condition level from "Bravo" to "Charlie."
"Charlie" is the third highest security level. It indicates an incident has occurred or officials have evidence that terrorists are planning an attack. Security measures can include thorough vehicle inspections and requiring an escort to get on base, according to a pamphlet from Joint Base McGuire-Dix-Lakehurst in New Jersey.
U.S. Northern Command raised the force protection condition level to "Bravo" in May just days after two suspected terrorists were shot before they could attack a contest in Texas that depicted the Prophet Muhammad as a cartoon.
Defense officials have said that NORTHCOM does not plan to raise the security levels on U.S. military bases, but the defense official explained that commanders have the ability to increase the force protection condition levels if they feel the need to do so.