Which scientist contributed to the design of military rockets?

William Congreve is recognized for his significant contributions to the design of military rockets, particularly during the early 19th century. His work with the Congreve rocket system was pivotal in creating a reliable and effective rocket artillery that was used by the British military. These rockets were notable for their use in warfare, which helped to enhance the battlefield capabilities of the British forces, particularly during the Napoleonic Wars.

Congreve's rockets were characterized by their ability to deliver explosive payloads over considerable distances, and they marked a departure from the earlier, less reliable designs. His introduction of standardized rocket components and the emphasis on improving their accuracy and range represented a major advancement in military technology. This innovation laid the groundwork for future developments in rocket design and artillery.

The other choices reflect notable figures in aerospace and military history, but their contributions do not specifically align with the design of military rockets in the same capacity as Congreve. For example, Sergei Korolev was a leading figure in the Soviet space program, John Glenn was a celebrated astronaut, and Roger Bacon was a philosopher and scientist from the medieval period known for his advanced ideas but not specifically for military rockets. Thus, the answer focusing on William Congreve accurately highlights his relevant historical impact in this field.