The Lockheed Martin VH-71
Lockheed Martin and Augusta Westland joined forces to create this monster of a copter. It wasn't a total disaster, but it wasn't one of their best moments as a combined force for monetary reasons. The VH-71 was released in 2002 for the Marine Corps.
The Marine Corps was thrilled with this chopper, which was good news! They even decided that the President should be transported in this specific brand. Eventually, the $11.2 billion bill dropped and everyone involved decided it just wasn't worth it. That was probably a good idea!