FWIW: The Navy is AGAIN back in the blimp flying business, which many people don't realize.

The Navy, (and DEA/DHS/Coast Guard?), now has several blimps that they utilize for radar picket duty mostly in the Carribean area looking for drug runners/smugglers (though I have personally seen a couple of the Navy blimps as far north Maryland's Eastern Shore).

Those Navy blimps are clones of the Goodyear Blimps (Goodyear built them) and are manned blimps. (there are also a few "teathered" blimp type balloons - ala like in WW1 - that also carry radar equipment to elevations of several thousand feet for watching certain approaches to the US)