https://www.dvidshub.net/video/559300/f-35-eielson-debut
F35 arrives for cold weather testing... Ok, not news.
However, around 1:25 in,one can see there's a pod on the spine of the jet I've not seen before, which appears to open and close. Anyone know what it is? I initially thought drag chute housing or something for 'icey runway tests' but then saw the shot of it 'open' in flight.