What type of cap is this?

[MadZombieLenin]

While browsing an online auction site I came across this cap. The seller describes it as a Soviet Uniform GRRAD Rocket CAP. I don't know what that is. At first I suspected the cockade was from another Soviet bloc country but my cockade guide has it as a:

личный состав военизированных подразделений по борьбе с градом Главного управления гидрометеорологической службы 1975
(It took me forever to type that...)

Not being able to read Russian, I translated it online as "personnel of the militarized subdivisions on the fight with the hail of the main administration of the hydrographic and weather service". That's not very helpful. Does anyone know what this cap is, and if the cockade is the proper one? I have a decent amount of Soviet caps now, but this is one I haven't seen.

The pics are the seller's. I couldn't save the inside one, but it's got a diamond from the Odessa factory, 1987.

It looks like an Aeroflot cap but with enlisted strap and standard army buttons. Since this navy blue with lighter blue piping is used in a few different caps, I wouldn't be surprised if it's correct. I rather liked it, so I thought I should research it some. Thanks!