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What’s NCVA at the end of the F135 engine? And what does it do?

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NCVA: Nozzle cooling valve actuator.

It allows a cooling flow to enter the nozzle. From Wikipedia:

In this configuration most of the bypass flow is ducted to the wing nozzles, known as roll posts. Some is used for cooling the rear exhaust nozzle, known as the 3-bearing swivel duct nozzle (3BSD).[37] At the same time an auxiliary inlet is opened on top of the aircraft to provide additional air to the engine with low distortion during the hover.[31]

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Source

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    $\begingroup$ "Valve" or "vane"? $\endgroup$ Nov 29, 2021 at 21:59
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    $\begingroup$ @OrganicMarble: Thanks!! Vanne is a French synonymous for valve... $\endgroup$
    – mins
    Nov 29, 2021 at 22:18

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