The Vertol Model 107 became the Boeing Vertol CH-46 Sea Knight. It has been a fabulously successful helicopter; development began almost *70* years ago, and some are still in service.
One suggested modification from 1961 would have seen the helicopter (designated HC-1A at the time) modified into an anti-tank variant using wire-guided anti-tank missiles. The artwork depicts the Model 107 modified with a “trapeze” that would lower from the belly holding one such missile (appears similar to the SS.11 / AGM-22) ; after launching the missile the launcher would retract back into the cargo bay where it would be reloaded and redeployed. At the rear of the bay is a manually loaded rocket launcher (though it looks more like a recoilless rifle to me) that would, after loading, swing down into a forward-firing position. Further rocket launching tubes were built into the extended rear landing gear sponsons; machine guns were fitted ahead of the cockpit.
