This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
QF inch Mk XII gun on class submarine AWM .jpeg AWM caption DETAIL VIEW OF INCH MARK XII GUN ROYAL NAVY SUBMARINE MOUNTING IN ACTION This appears to show QF inch Mk XII gun on an unidentified class submarine NAVAL HISTORICAL COLLECTION circa World war II photographer not identified Copyright expired public domain PDAustraliaGov