U.S. Military Bases Under Heightened Security After Terrorist Threats

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TRAVIS AIR FORCE BASE --

GM Towing rolls out to handle other people's disasters from a command center right across from Travis Air Force Base.

Evidence that the base was trying to protect its services members and their families from a disaster of their own was clear early this morning.

"There was a big long line all the way out to Parker Road's light this morning with the high security alert," said tow driver Kenny Saroff.

That line was created by the more intense checks being done at the front gate in the wake of new threats from the violent extremists behind ISIS.

While few specifics have been released, the situation raised the security stance at all U.S. military bases to Force Protection Bravo -- the highest its been since the 10th Anniversary of the 9/11 terror attacks on America.

Force Protection  Bravo, requiring stepped up security at military bases like Travis, is the third level of alert in a five-tier protection system.

The Defense Department describes it as a "prudent measure to mitigate threats."

Saroff says the whole thing makes him nervous.

"We've always thought if they bombed this place everybody would be gone for square miles. So it's one of those things you just live with.  If it's your time to go, it's your time to go," he said.

Saroff and FBI director James Comey, both worried about the number of people in the U.S. connecting with ISIS online as revealed by the recent attack at a Prophet Mohammad cartoon contest in Texas.

The two male suspects who were killed were both ISIS sympathizers.

Reports indicate that the military's concerns came  those men were supposedly inspired by an tweet from an Islamic extremist sharing the name and address of a U.S. military officer.

A few storefronts closer to Travis,  queen Jeri Wallace-Evans is lining up meals for hungry airmen at C.J.'s.

How does she feel about the new threat level?

"Actually it gives me a little more security. They're gonna be more on their job," she said.

Lots of confidence, but she also quickly acknowledges this:

"I haven't gotten nervous yet. But  if something happens I'll probably have a whole different attitude."

No timeline's been given for how long U.S. military bases will stay at this heightened alert level.