Certainly there are attachments.
Saudi Airbases are full of Americans performing all sorts of typical airbase functions.
The armament inventories are also dependent on them.
US has a direct maintenance contract with the Saudis. I.e. if the US says so, not a single jet receive support.
Saudis also have virtually no ISR capabilities, these are also provided by US intelligence.
The Americans also determine in what circumstances you are allowed to use the aircraft.
US also blocked the sale of PGMs to Saudi AF a few weeks ago. This military simply cannot function with the US.