The Belgian Army version of this model shows Tamiya XF-62 as the color for this vehicle, but the paint is the lighter WW2-style US olive drab, and I expected it would be the darker olive drab used by NATO, judging from other Belgian vehicle pictures I've seen. Or is this right?

Paints are very subjective and I would never take kit painting instructions verbatim as the correct colour. It is probably pretty close.

Everyone's eyes are different and what it looks like on digital may not be what it looks like in real life. My suggestion is to mix some paints, try some test patches and base them on reference images. I once mised 12 different paint patches using six different paints to get the colour I thought was correct.

Here's plenty of Belgium Scimitars to check out the colours:

http://www.armyrecognition.com/europe/Belgique/vehicules_legers/CVRT/Scimitar/Scimitar_Belgique_diaporama.htm

Thank you for the pix.

The vehicles are probably NATO green, then. Postwar olive drab would be too dark.

I don't think they are NATO green...NATO green is far more green of a colour than the images in the link I posted.

I would suggest looking at the Tamiya JGSDF Olive Drab XF-74...I think you will find it a much closer match...you can do pre-shading, post-shading, washes, pastels, pigments, etc to vary the base colour.

Remember, AFVs weather and change colour very quickly. Don't expect an out of the bottle/can to match reference images.

You're welcome for the link.

I wasn't sure if said vehicles were painted in a British green, a NATO green, or whether the Belgian military has their own special green color.

I'd say it is their own colour. All their single colour green armour...Leopard 1BE, CVR-Ts, and M113s seemed to be this lightened shage of OD.