I'm starting to think that this helicopter never existed and everything was a hoax...
Or.. after a second thought, and considering that in WW2, in the Normandy campaign some L-4 Grasshoppers were fitted with bazookas on their wings... maybe it wouldn't be very absurd to think that the XX-9 was a project or prototype of a
XR-8 fitted with rocket launchers to the sides of those landing gears...