Especially people who serve no useful purpose on the mission.

Still, those who use them say they serve a useful purpose.

The scientists of the time still saw no useful purpose for it.

My way you can not only remain dead, but serve a useful purpose.

In the final issue you seem to have served no useful purpose.

So far as he knew, God's fire served no useful purpose, but it was pretty to look at.

I actually don't think politics and government serve much of a useful purpose.

I think you serve a very useful purpose, especially tonight.

No useful purpose could be served by going longer without rest.

I hope this simple story will serve some useful purpose.