Here's a link to the Register's article about the Tustin air hangar re-use. The article is headed as follows: "Military museum plan loses out. Supervisors OK making the Tustin north blimp hangar into a gigantic sports complex for $100 million."
As much as I'd like to see the hangars remain hangars, (with miles of empty space around them,) the odds of that happening in Orange "Pave Everything" County are basically nil. And the military museum idea never developed the broad base of support it needed. As such, I'm in favor of an adaptive re-use that saves at least one of these historically and architecturally significant structures.