The Advanced Electronics Co., Riyadh, Kingdom of Saudi Arabia, has been awarded a $10,605,836 modification (PZ0002) to contract FA8575-20-C-0004 to definitize the previously awarded letter contract for the F-15 Royal Saudi Air Force (RSAF) Electronic System Test Set (ESTS). Services acquired under this effort are to provide the RSAF with an upgraded ESTS. The RSAF currently uses an A31U18240-2 ESTS configuration, and this shall provide the scope to upgrade and install the A31U18240-3 and A31U18240-4 configuration (frequently referred to as -3 and -4, respectively), as well as familiarization training, regression testing, and travel. Work will be performed at the RSAF Central Maintenance Facilities within the Kingdom of Saudi Arabia; the Science and Engineering facility in Huntsville, Alabama; and Robins Air Force Base, Georgia, and is expected to be completed April 16, 2021. Foreign Military Sales funds in the amount of $6,513,391 are being obligated at the time of award. This award is the result of a sole-source acquisition. Air Force Life Cycle Management Center, Robins Air Force Base, Georgia, is the contracting activity.