via This Tilt-Rotor Aircraft Could Be The Future Of The US Army’s Helicopter Fleet – Business Insider.
 
The US military wants to upgrade its stable of combat choppers.
One possible model for future combat aircraft can take off and land vertically, and then fly like a traditional airplane.
Bell’s V-280, which combines a combat helicopter’s fuselage with tilt-rotors, would basically be a Black Hawk that can adjust its thrust to fly like a fixed-wing aircraft once it’s airborne.