Aircraft built by the military to refuel other capable aircraft
(other military craft basically) in midair.
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There are no current military aircraft with 6 engines.
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Military aircraft are built to fight or to aid in a war
effort.
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military aircraft are used for military purposes i.e combat,
military cargo, extraction of troops and etc..
civil aircraft are ones use for commercial airlines for example.
British airways and Qantas.
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If you're looking for military aircraft parts, you can find them
available for purchase on many different websites. Some sites that
offer military aircraft parts are Military Aircraft Parts, DIMO
Corporation, and Skylink.