This is Luftorpedo Fi 105 C in flight
Rocket propulsion is used to accelerate to start the ramjets during the long take-off run and for ascension to interception height. Before that, his bi-fuel tanks must be nearly exhausted.
The transparent plastic cone is ejected just before firing the rocket salvo, and is placed to improve aerodynamics during the initial phase of the mission. It is transparent to allow ground crews to check the rockets before flight.
Ramjets are optimised to fly at 980 Km/h at 10.000 m height.
Bubble canopy was the first design put into production, later replaced by the design with two large optical sights and lateral circular flat windows (the same used by the V.T.O.L. "A" version).
Rocket salvo attack is needed to assure the destruction of incoming bombers armed with nuclear devices or other special mass-destruction weapons. If a sole bomber can escape undamaged, it can accomplish his mission provoking inmense damage to people and installations. This scenario must be avoided at any price. This scheme was active during the early years of the Cold War.
The recourse to nuclear bombs in a stage of a large conventional war is only logic in the part of a contendant that is losing a war of extermination against an enemy that threatens his survivability. This was not the case of Western Allies during WWII.