noun
air power
Refers to a nation's military strength in the air, including aircraft, missiles, and related capabilities.
その国は空軍力を増強している。
That country is strengthening its air power.
軍事力 is broader, meaning 'military power' in general, whereas 空軍力 is specifically air power.
Compound of 空軍 (air force) + 力 (power, strength).