Free images results:
 

Tank pictures, stock photos and images

 
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Tank Stock Photography
Author: Steph_nic
Port 1 Stock Images
Author: Camptown
APort 7 Stock Photos
Author: Camptown
APort 4 Stock Image
Author: Camptown
APort 6 Stock Photography
Author: Camptown
APort 2 Royalty Free Stock Photo
Author: Camptown
Water Tower Royalty Free Stock Photography
Author: Suti
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Tank. Stock Image
Author: Johnjewell