[smackfu]

It's mainly a poor summary of those agreements, of which the Key West Agreement was only the first. A better way to put it would be that the Army is not allowed to have fixed-wing aircraft, and the Air Force is not allowed to have helicopters. The Navy is just restricted to air operations that support a naval campaign.

[ZanyProgrammer]

The Air Force also has helicopters.

[hugh4]

You seem to be correct -- Wikipedia says the USAF has about 200 helicopters for search and rescue and "utility".

Presumably an exception to the rule.