ammunition angled angles appearance bullets cartridges death defense destruction destructive gun machine-gun military mobility mounted mounted-machine-gun movement pain weapon weaponry World-War-2-tank wounding WWII-tank aim aimed aiming anti-aircraft-gun Australian-Defence-Force barrel coast coastal-defence defence defensive hilltop mounted-gun placed placement protection protective shrubbery upward vegetation World-War-2 wwii Australian-Defense-Force coastal-defense combat-readiness defend defending emplacement equipment gun-emplacement gun-platform gun-turret heritage historic history secure security trees vantage-point weapons