The system is designed for use primarily against jet aircraft and helicopters in any kind of weather.

Missiles could offer a degree of protection against treetop-hovering helicopters.

Also, it demonstrated that the new attack helicopter would need to be able to defend itself against other helicopters and aircraft.

The weapon was primarily designed for anti-tank use, or against low flying helicopters.

Bush Administration officials, however, have been ambiguous about what actions might be taken against Iraqi helicopters that are being used to attack rebel positions.

Surely New York had laws against helicopters being that close to apartment buildings.

The Stinger can also defend against helicopters, but not other missiles.

Today its employment is against tanks, helicopters and fortifications.

In recent years, there has been relatively little small-arms fire against helicopters, the official said.

Heavy machine gun fire against helicopters had also been unsuccessful.