For many, the Sikorsky UH-60 Black Hawk helicopter, like the one involved in the Wednesday collision over the Potomac River ...

A Black Hawk helicopter can transport up to "12 fully equipped, seated troops in combat," according to Lockheed Martin, the ...

"A PSA Airlines Bombardier CRJ700 regional jet collided in midair with a Sikorsky H-60 helicopter while on approach ... according to Lockheed Martin, the weapons company that builds the helicopter.

The Black Hawk helicopter has been in service since 1979, but what makes it so special, that 36 countries use it? Here's everything you need to know.