It’s the sound generally written in English as <sh>

The only real skill involved is enough airbrush practice to be able to spray reasonably finely: I didn‘t do more than put an overall coat of olive drab onto the model, followed by spraying field drab (an ugly greenish-brown colour) in semi-random patterns onto most panels, larger areas of raise detail, the top of the gun barrel, etc. — the idea is to avoid edges with this, so it ends up in the middle of open areas. Then it was just an overall wash with a darker version of the base colour and an overall drybrush with a lighter one of same. No fancy painting techniques involved at all
Just give it a try on your next model — if it goes wrong, just re-spray the whole thing in the base colour and you’re back to being able to use your normal methods instead
The third is a similar triangle on the left side of the turret, and that’s it.
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