From the news that the Bush-era deal for the sale of $60bn of weapons to Saudi Arabia:
The arms package includes 84 new F-15 fighter jets and upgrades to 70 more F-15s that the Saudis already have, as well as three types of helicopters: 70 Apaches, 72 Black Hawks and 36 Little Birds. Saudi Arabia would also get versions of a satellite-guided "smart bomb" system, plus anti-ship and anti-radar missiles.
What will they use all of these helicopters for? Future incursions into Yemen? Riot control in Dhahran province? Counter-terrorism in the Empty Quarter? Helicopters, unlike F-15s, are not really for engaging another state (like Iran) in the case of a major regional conflict.