Explain why militarry pilots must wear masks that provide oxygen when flying at high altitudes.?

Military pilots must wear oxygen masks at high altitudes because the air pressure decreases, leading to insufficient oxygen levels for normal breathing. At altitudes above 10,000 feet, the reduced oxygen can cause hypoxia, impairing cognitive and physical functions. The masks supply supplemental oxygen, ensuring pilots maintain optimal performance and safety during flight operations in challenging environments. Additionally, the masks protect against cabin depressurization and other emergencies.