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If you take a look at the photo (source: still from this YouTube video), you'll notice a pair of "panels" on the fuselage of this Omega Tanker DC-10 (reg: N974VV), circled with green.

There is also a pair of "portholes" (circled red).

What are all those? Any relation to this being a tanker?

Note: Here's a photo that shows the "panels" closed on the ground.

Omega Tanker

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The things circled in red are static ports. They are used to measure static air pressure. You can see a close up (from a different aircraft) here:

Static Ports
(taken from this answer)

What you circled in green is an outflow valve used for controlling the pressurization. See also:

It is technically called a Thrust Recovery Outflow Valve:

The actual nomenclature is the "Thrust Recovery Outflow Valve"

[...]

The thrust recovery outflow valve is essentially the valve that controls cabin altitude throughout the isobaric selection range. It can be controlled electrically through 2 electric motors receiving input from the automatic and semi-automatic cabin pressure controller/computer. On the -10's with Flight Engineers, the clutches could be disengaged via a handle at the FE station, and the valve was then controlled through a manual wheel.

(Airliners.net)

Both items are unrelated to the fact that this is a tanker. The following image shows the same items on a Northwest Airlines DC-10-40:

Northwest Airliners DC-10-40
(Airliners.net)

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