If so, why had they not contacted the American base?

Before that, the advisers had been living at an American base.

The police would give no details about the plan to attack the American base.

She walked for a while and ended up by an American military base.

Some of those are former workers on the American base.

On average the American bases came once every eight miles.

It is the worst shooting ever to take place on an American military base.

Every American base has been on alert for him a month.

It was the second protest at an American military base this week.

In 1973 the mountain was closed as an American base.