Blast from the past. Sikorsky S-72.

Ashton Carter has decried the current state of the US helicopter industry. 

He's wrong.  A quick look at past experiments, test beds and flying prototypes reveal that even old US ideas would be relevant even today.  A great example of that is the Sikorsky S-72.  Imagine the flexibility one of these aircraft would have in the attack role!  Stats from Aviastar.

Technical data for Sikorsky S-72 RSRA Crew: 2-3, engine: 2 x General Electric T-58-GE-5 turboshaft, rated at 1045kW and 2 x General Electric TF-34-GE-400A turbofans, 4180kg of thrust each, main rotor diameter: 18.90m, wingspan: 13.74m, fuselage length: 21.50m, height: 4.42m, take-off weight without auxiliary jets: 8300kg, empty weight without auxiliary jets: 6535kg, take-off weight with auxiliary jets: 11815kg, empty weight with auxiliary jets: 9480kg, max speed without auxiliary jets: 296km/h, cruising speed with auxiliary jets: 258km/h, max speed without auxiliary jets: 581km/h, cruising speed with auxiliary jets: 370km/h, ceiling: 3050m