Whilst the group gathers inside to plan for their return to Hell, an enemy helicopter performs a close examination of the house.

The player controls a jet fighter and has to destroy a set number of enemy helicopters in order to clear a level.

He knew an enemy helicopter when he saw one.

The alternative was to travel on bare and slightly elevated ground, not something to be contemplated with enemy helicopters about.

"We have reports of enemy helicopters in your area."

In some computer ports, there is an additional level between levels 3 and 4, featuring enemy helicopters.

Players seek out enemy helicopters with a radar screen, then fly using a top-down perspective toward their targets.

One of them took out an enemy helicopter, which crashed in flames.

North Korea said early today that an "enemy helicopter" had been shot down.

Most significantly, they made Air Force history by using a laser-guided bomb to down an enemy helicopter.