fyi the vast majority of the f-35s are stored in these buildings, underground with elevator lifts lowering them. not sure about the fortification but it can't be too much. and it sounds like one f-35 was maybe hit in the unfortified hangar in those photos we all saw. somebody posted a satellite pic of the tail of an f-35 sticking out, before it was destroyed. probably one of the f-35s on standby for emergency missions, so it wasn't below ground.
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