One major objective of US help is to get control of Aramco, the oil center of world.
Its been many years that US is asking SA to float stocks of Aramco, so far SA has not agreed, but it looks near with Mbs in control. Giants like exxon, mobil or Bp have their mouth open to gulp stocks and gain control of world oil future. Any way, the way Saudees are spending, they need to do some thing to continue control with just .08 growth.
I do admit that MBS believes in looking for other resources than oil for growth. If he succeeds in future, then in next decade SA will be very different country with US companies in control of oil.