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In page McDonnell Douglas F-15E Strike Eagle:

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In November 2009, Royal Saudi Air Force (RSAF) F-15s, along with Saudi Tornados, performed air raids during the Houthi insurgency in north Yemen. This was the RSAF's first military action over hostile territory since Operation Desert Storm in 1991.[1] In October 2010, Saudi Arabia requested 84 F-15SA (Saudi Advanced) fighters, the upgrade of its existing F-15S fleet to F-15SA standard, and related equipment and weapons through a Foreign Military Sale.[2] On 29 December 2011, the U.S. signed a $29.4 billion contract to sell 84 F-15SAs, as well as the older F-15S upgrades.[3] A Foreign Military Sales contract for 68 F-15S to F-15SA modification kits was placed with Boeing in June 2012.[4] The first flight of a new-build F-15SA occurred on 20 February 2013.[5]