Because of its low density, natural gas must be compressed in order to be stored in tanks for use aboard vehicles.

Satellite tracking systems and self-steering antennas are used aboard ships, vehicles, or aircraft to maintain contact with satellites.

So far, we have had to do our experimenting in cramped quarters aboard unsuitable vehicles, usually when they were engaged on some other mission.

Specialists aboard helicopters or all-terrain vehicles are to converge on the capsule to secure it and document its landing area.

Artists who trust themselves to a journey whose destination is unclear before arrival are not likely to climb aboard vehicles of theory.

When the loyalist reinforcements rolled into the capital aboard tanks and armored vehicles and began to wrest the initiative, the rebels began to break.

Civilian supporters joined the rebels aboard armored vehicles in the takeover of the Government television compound.

The preliminary flight certification (PFC) program, which would clear the way for the SSMEs to be flown aboard manned vehicles, began in early 1980.

Some pursued on foot; others leapt aboard vehicles and so gave chase.

Some of the Trackers were armed with carbines, and rode aboard blue six-wheel vehicles - a type Steve had never seen before.