Both Boeing and Airbus have defence contracting arms, that doesn't mean all of their platforms have defence purposes.
AFAIK there is no military variant of the A380, Airbus's current civilian platforms with military variants are the A310[0] and A330[1] and their own derivatives (KC-45 which derives from the A330 MRTT).
[0] https://en.wikipedia.org/wiki/Airbus_A310_MRTT
[1] https://en.wikipedia.org/wiki/Airbus_A330_MRTT