If you live in or you do business in Moslem country bribery is a way of life. It is called Baksheesh (spelling). It could be in the millions or it could be a measly $25,000 US. In Iran the Shah got 2% of everything whether from legitimate businesses or from Baksheesh. Bell Helicopter had to pay $25,000 to a local customs agent to allow entry of frozen turkeys, canned hams and Doritos and peanut butter for the Thanksgiving holidays and the same for Christmas. Lockheed had to pay $75,000 to a customs collector to allow entry of a GE gas turbine for one of the Iranian Air Forces’ own Phantoms. This was written off as a cost of doing business and the US DOD picked up the tab.
Regarding bribery on defense programs I personally have seen a lot of it.