Dump valve for the unnecessary air from the APU when it's running and NOT trying to start the engine. Good chance my choice of words is completely wrong.
It is just APU exhaust. Fuel dump is from the underside of the wing.

Dump valve for the unnecessary air from the APU when it's running and NOT trying to start the engine. Good chance my choice of words is completely wrong.
Does the F-35 have the ability to jettison the canopy?
I will preface this by saying I probably don't know what I am talking about and my flight experience is limited to about 50ish hours in a Cessna 172SP. While I think the F-35 is very sexy, it seems to me like this jet doesn't have any rearward visibility. Is that not supposed to be that big of a deal in a multirole fighter?