A helicopter is used by the Bureau of Land Management to round up wild horses

A helicopter is used by the Bureau of Land Management to round up wild horses

A US rescue helicopter carrying flood victims flies across the Swat valley

A US rescue helicopter carrying flood victims flies across the Swat valley

A helicopter flies over a fire after forest fires hit the area of Ourense

 A helicopter flies over a fire after forest fires hit the area of Ourense

U.S. Marines carry a comrade wounded by an improvised explosive device (IED)

U.S. Marines carry a comrade wounded by an improvised explosive device (IED) to a waiting medevac helicopter

Flood victims run towards a Pakistan Army helicopter to grab aid being dropped

Flood victims run towards a Pakistan Army helicopter to grab aid being dropped

A firefighting helicopter flies through smoke from a wildfire in Vari,Greece

A firefighting helicopter flies through smoke from a wildfire in Vari,Greece

A helicopter carries water before releasing it over a forest fire near the settlement of Kustarevka

A helicopter carries water before releasing it over a forest fire near the settlement of Kustarevka in the Ryazan region

Flood victims looking to be evacuated are framed from inside a Army helicopter

Flood victims looking to be evacuated are framed from inside a Army helicopter

A helicopter drops water over a forest fire in Carvalhal

A helicopter drops water over a forest fire in Carvalhal, near Sao Pedro do Sul

A helicopter prepares to drop water on a forest fire burning

 A helicopter prepares to drop water on a forest fire burning at Serra da Gralheira

Pakistani flood survivors try to catch food bags from an army helicopter

Pakistani flood survivors try to catch food bags from an army helicopter in Lal Pir 

Marooned flood victims looking to escape grab the side bars of a hovering Army helicopter

Marooned flood victims looking to escape grab the side bars of a hovering Army helicopter which arrived to distribute food in the Muzaffargarh 

A military helicopter replenishes its water supplies for firefighting from a lake

A military helicopter replenishes its water supplies for firefighting from a lake outside the village of Plotava

A U.S. medical helicopter arrives to evacuate soldiers who were wounded

A U.S. medical helicopter arrives to evacuate soldiers who were wounded when one stepped on an improvised explosive device.

A US Marine helicopter flies toward the New York City skyline

A US Marine helicopter, supporting the visit of US President Barack Obama, flies toward the New York City skyline

Technicians work on a MI-8 helicopter as the sun rises at Kandahar air base

REUTERS PICTURES 

Technicians work on a MI-8 helicopter as the sun rises at Kandahar air base

SH-60 Sea Hawk helicopters

SH-60 Sea Hawk helicopters assigned to Anti-Submarine Squadron (HS) 7 depart Naval Air Station Jacksonville, Florida January 13, 2010, to embark aboard the aircraft carrier USS Carl Vinson (CVN 70) en route to Haiti. REUTERS/Gary B. Granger Jr./U.S. Navy photo/Handout

Rescue personnel evacuate the injured from a crashed Robinson 44 helicopter

Rescue personnel evacuate the injured from a crashed Robinson 44 helicopter in Fiambala, Catamarca province January 4, 2010. The pilot, co-pilot and two reporters who were following the Dakar Rally sustained injuries when their helicopter crashed.
Credit: REUTERS/Ministry of Defense/Handout