Its principal mission is to defend the nation, but it serves more as an internal security force.

It also said the center would continue to view its principal mission as that of promoting American culture in an international context.

The principal mission of the consulate back then was to bring emergency assistance to new immigrants.

The principal missions are to defend the nation and protect the territorial integrity of the country.

It was the first international organization whose principal mission was to maintain world peace.

Its principal mission is to furnish opinions about foreign law to the administration, the courts and the public.

One of the group's principal missions, they said, was to nurture independent politics to the point where a third party could be born.

The guerrillas failed in their principal mission, destroying the bridges.

But I need to make clear that combat is not our principal mission.

And for decades to come, "that will continue to be our principal mission."