[Syntyr]

Yes that F15 has 4 external gas tanks. The round ones that are obvious under his wings are drop tanks. So named because when moving to an Air to Air engagement the pilot can “drop” or jettison them. It also looks like that particular Eagle is equipped with what they call FAST or Conformal external tanks . They are tanks that are fitted to the side of the aircraft body. They allow carrying extra fuel and sensors, Fuel And Sensor Tactical, while decreasing the drag of the external tanks.

[Hulka]

Expanding the downloaded “large” file, there are no CFTs on the F-15. As a former F-15E fighter pilot, I am very much aware of what the CFTs look like, So, what you see are externals, engine inlets, as well as AAMRAM and ACMI pod. No CFT's

[JRios1968]

Yes that F15 has 4 external gas tanks.

No he doesn't. F-15C and D (also known as "light grays" or "Fleagle") models do not have the conformal FAST tanks found only on F-15E Strike Eagles (also known as "dark grays" or "Mud Hens".)