Which system provides a streamlined shape and must withstand heat, stress, and vibration in rockets?

The airframe system is crucial for rockets as it serves as a structural framework that not only shapes the vehicle for aerodynamic efficiency but also must endure extreme conditions during flight, such as high temperatures, significant stress, and vibrations. The airframe is designed to withstand the intense forces during launch, ascent, and atmospheric entry, making it a pivotal component in ensuring the rocket remains intact and performs its intended mission.

In this context, while the guidance, propulsion, and control systems are essential for different functions within the rocket, they do not primarily focus on the overall shape and structural integrity required for withstanding the harsh conditions experienced during flight. The airframe's design directly impacts the rocket's performance and safety, highlighting its importance in aerospace engineering.