Answer

If the specified kit is available at the time, but not at your rank, you can scroll through the "not bought" section in the garage into the place where kits/paints aren't accessible to you yet. You can find the kits in that area, plus the rank they are available at.
Hope this helps,
Bluebird13.

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It is available at Warrant Officer 5
Customer support service by UserEcho
It is available at Warrant Officer 5