Yep, that is why I said most, not all naval roles. IMO, AWAC role for naval bases would be the use. But by 1930, I doubt they would be used to attack anything directly.
We don't have to make the CP win, the USA got German assets as reparations, we just need the US Navy to view it as a useful ship as early warning, and have say 6 Zeppelins at San Diego, 6 at the Panama Canal, and 6 on the east coast of the USA. When the fleet moves to Pearl, the Zeppelins go, and they have radars equip. Two are up at any time, one NW of Pearl, one SW of Pearl, each with a 200+ mile radar search area. I doubt the Japanese would even attack if they new we would likely spot their convoy with Zeppelins. The US navy experiment with Zeppelins, but by 1925 and the budget cuts related to the limitation treaty, dropped the program. To a large extent, deployment of new weapons had a 10 year gap.
Or Midway is another example of where a night Zeppelin would be ideal. The US Navy could have an exact location of the Japanese fleets with 300 miles of Midway by 4 am. Now the Zeppelins likely die a horrible death when the Japanese find them, but they would have been excellent use of a few dozen men's lives.
My main issue is that i am not sure how much a radar weights, it would need to be in the 4K to 10K range for a Zeppelin to be practical. And a lot depends on the height of the ship, the coverage range at 20K feet is a lot better than 5K feet.
If you haven't seen it, you might want to read this. With luck zeppelins could have been quite useful in WW2:
https://www.alternatehistory.com/discussion/showthread.php?t=118973&highlight=Naval+Airships