In reference to all military aircraft, what is a common characteristic they all share?

A common characteristic shared by all military aircraft is that they typically exceed safe noise exposure limits. Military operations often involve high-performance aircraft designed for speed, agility, and power, which results in increased noise levels. Many military missions require the ability to conduct operations in a variety of environments, which includes being able to operate at lower altitudes or in close proximity to ground forces, further contributing to noise levels that exceed safety thresholds.

In contrast, while some military aircraft operate at high altitudes, not all are designed for this purpose; many are created for low-level tactical missions. Furthermore, not every military aircraft possesses advanced technology; some may be older or designed for specific non-combat roles. Lastly, stealth capabilities are present in certain specialized aircraft but are not a universal feature across all military aircraft. Therefore, the aspect of noise exposure is the most consistent characteristic among them.