From 1998 to 2006 he was the chief of the national security.

We should look at their education as a matter of national security.

On the other hand, there is the issue of national security.

Other important issues included national security and the war in Iraq.

The most important issue is, as it should be, our national security.

The most important issue in the 2004 election should not be national security or the economy.

He was, on the other hand, quite concerned about Iraq and national security.

"Are you going to tell us this is all about national security?"

This has nothing to do with national security or the police.

The Director said the group was a threat to national security.