The military helicopter that collided with a regional jet near Ronald Reagan Washington National Airport, in a crash that killed all 67 people aboard both aircraft, was a UH-60 Black Hawk, considered the “workhorse” of U.

The military helicopter UH-60 'Black Hawk' and the American Airlines regional jet Bombardier CRJ700 that collided over Washington are aircraft commonly used worldwide. The plane was carrying 60 passengers and four crew members,

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.