unmanned

an unmanned level crossing.

the need for unmanned and expendable launch vehicles.

Scientists say these unmanned flights can make important and exciting discoveries.

A Royal Marine poses for photographers with the Unmanned Vehicle Robot, Testudo, at the launch of the Defence Technology Plan in London February 26, 2009.

Unmanned flight is the future of domestic aviation.

An unmanned military test glider did it in 2011.

I think it has applications for unmanned space flight.

He is a big supporter of using unmanned aircraft.

The wings of the unmanned MQ-9 are 20 meters wide.

It would be the world's first unmanned sample return.

That includes things like ammunition, armored vehicles and unmanned aircraft systems.

Two types of unmanned aircraft are now approved for civilian use.

The unmanned flight is scheduled to last four and half hours.

The pentagon showed off the world's largest unmanned surface vessel.